Menacing= threatening
Interminable= Continuous or never-ending
Exuded=To give off a smell or attitude
Noxious=poisonous
Vast=huge
Monotonously= Repeating the same actions so that it becomes boring.
Melancholy= Deeply sad
Inhabited=Lived in or on
She is supporting an inference from the text. An inference is something that is implied, and the person saying they've "witnessed much fighting" infers that they're old, whereas "I am wounded with iron" can be taken to mean he's been wounded by a weapon like a sword.
A. It shows that Cassius thinks that Brutus is too optimistic.
What Cassius is basically asking Brutus is whether he is willing to be humiliated and be marched through the streets tied up as trophy because this is what usually happened to the defeated. What Cassius is trying to communicate to Brutus is the notion that he should consider the consequences of what were to happen should he happen to fail.