I sharpened my skills under the mentorship of my coach.
You need a noun to complete this sentence, and mentorship is the only noun here - the rest of the words are adjectives.
Answer:
Yet
Explanation:
Yet is the right answer that you're looking for :)
Any time an object is in motion, it is both producing energy and, in many cases, expending energy.
A. affect
Affect can sometimes be a noun, but it is mostly used as a verb that describes some sort of change or difference.
On the other hand, the word effect is not an action nor verb; it is a noun that refers to the result of a cause.