"Which one is the best" is obviously a question format, so it makes sense that " which one the best is " should be the correct form. This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural.
In your context, the best relates to {something}, whereas best relates to a course of action. Plastic, wood, or metal container? What was the best choice for this purpose? Plastic, wood, or metal container? What was best to choose for this purpose? Either is acceptable, and the practical meaning is the same, but their referents, implicit not explicit, are different.
This explains why 'least worst' is logically absurd, yet it accepts 'least bad'. Does 'least bad' = best? Is this adjective grammatically valid? It sounds wrong and superfluous. If "more/most good...
A (about) and C (regarding) are synonymous. About is the most natural preposition, regarding is more stilted. They both indicate questions which concern the course itself, such as what topics will be covered, what time it takes place, what the prerequisites are, … Regarding works better on narrower subjects. I have a question about mathematics, regarding continuous functions. About applies ...
The word "best" is an adjective, and adjectives do not take articles by themselves. Because the noun car is modified by the superlative adjective best, and because this makes the noun car definite in this context, we use the. It is best not to do something. Here, we have the adjective best, but this adjective is attached to no noun.
The "one" could imply that of the alternates only ONE choice is possible, or permitted. "Which" alone could indicate several choices from the set of alterates could be selected in various combinations. Of course, speakers are often very imprecise about their meanings & intentions when saying "which" or "which one". Usually the context makes it clear if the choices are mutually exclusive or not ...
Aspirated t and unaspirated t have a phonemic difference, but they don't ever create a semantic difference in English that I can think of. (Unlike, for example, pat and bat, which is a phonemic difference that makes a semantic difference.) So "can" you make the unaspirated sound? Sure: you won't be incomprehensible, you'll just sound weird.
To the best of your knowledge and belief, are you aware of any contract or agreement with your current employer (or other company), such as a non-competition or non-disclosure agreement, that impact or interfere with your ability to work for the Company? if I answer "yes" ~ That means I am aware of any contact and there isn't any.
Distance The word distance is meaningful in both an uncountable sense and a countable sense. So, the type of determiner (or lack of any determiner) that you precede it with, or whether you use the plural, indicates how you want the listener to understand it. First, here is uncountable distance: Let's put some distance between us and Houston. [That is, let's drive away from Houston.] The force ...
Well there a couple of things happening in the sentences cited. First whoever "he" is seems to have suffered some sort of misfortune. Second the writer is obviously very religious and has the opinion that everything is part of God's plan and that God always has a positive motivation. So in spite of the immediate misfortune, for the "he" things will ultimately be "better" in some overall sense.