He was able to . . . . . . . his small income by working in a hotel at night.

The correct answer is B. supplement.

To supplement something is to add to it in order to make it complete or better. In this case, the man was able to supplement his small income by working in a hotel at night. This means that he was able to earn more money by working a second job, which helped him to make ends meet.

The other options are incorrect because they do not accurately describe what the man did. Option A, amplify, means to make something louder

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