The correct phrase is "earn his living," which means to make money to support oneself.
Step 1: Understand the meaning of the sentence
The sentence talks about the efforts a person makes to survive or sustain themselves economically. Step 2: Analyze each option
- Option A (enjoy): "Enjoy his living" is not a commonly used phrase and doesn’t reflect struggle.
- Option B (eat): "Eat his living" is grammatically and contextually incorrect.
- Option C (earn): "Earn his living" is the correct idiom, indicating that the man works hard to make money for his livelihood.
- Option D (spend): "Spend his living" makes no logical or grammatical sense.
Hence, the most meaningful and idiomatic choice is "earn."