Get one's bearings means to find one's position or understand a situation. The correct answer is this meaning because the expression is used figuratively, not only by its literal words.

Examples:

• After joining the new college, she needed time to get her bearings.
• In an HSC essay, Get one's bearings can express this meaning: to find one's position or understand a situation.
• When this expression appears in a passage, connect Get one's bearings with the idea of to find one's position or understand a situation.