Select the most appropriate idiom to fill in the blank.
I have often seen her ______________ her classmates over small issues.

Correct option is C

Option (c) "picking a quarrel with" is the correct meaning to fill in the blank.
Picking a quarrel with: This idiom means to deliberately start an argument or conflict with someone, often over small or trivial matters.
Example: She is always picking a quarrel with her siblings over who gets to use the TV.
Meanings of the other options:
· Taking stock of: To carefully consider or assess a situation before making a decision.
· Taking time out: To take a break or pause from an activity to rest or consider something.
· Picking her way to: To move carefully through something, often used literally, as in navigating a difficult path.