I'd say A.
The word "describing" or almost anything ending with "ing" signifies an action occuring now, or in the present. B, C, and D use "when describing" which leads to the assumption that these things listed are taken into account while the landscape is being described but answer choice A uses "when they describe" which is passive rather than active.
Answer:
The bravest is someone who decides not to follow along with behavior of a group because they may look down on you and threaten you and do all sort of things but being brave and courageous keeps you going.
Yes, one should make sure that the subjects and verbs agree
