When should the ves ending be added to form plural nouns?
A. When the noun ends in s
B. When the noun ends in f or fe
C. When the noun ends in a vowel and y
D. When the noun ends in a consonant and y

The answer to your question would be B.

because...

leaf --> leaves

explanation:

it's important for any number of settings.   but then i'm a retired teacher and my view may be biased.

it certainly will not weigh as a minus when applying to a college, while poor grades always work against you.

other factors are important like what you do to improve the community.  

did you figure it out? i need on this same question