Get a word in edgeways means to manage to speak when others are talking a lot. The correct answer is this meaning because the expression is used figuratively, not only by its literal words.

Examples:

• He talked so much that I could not get a word in edgeways.
• In an HSC essay, Get a word in edgeways can express this meaning: to manage to speak when others are talking a lot.
• When this expression appears in a passage, connect Get a word in edgeways with the idea of to manage to speak when others are talking a lot.