Concept:The idiom “to sink or swim” means to succeed or fail entirely by your own efforts, with no help from others.
Explanation:The phrase “left to sink or swim” suggests that Yaro was given no assistance or support.
He had to rely completely on himself to survive or succeed.
This matches the idea of surviving on his own.
Option A is not correct because the idiom does not specifically mean finding a new job.
Option B is not correct because no literal shouting or calling for help is involved.
Option D is not correct because the idiom does not describe an emotional state like depression.
Therefore, the most accurate meaning is that Yaro had to manage by himself.
Answer:C. had to survive on his own.