The correct answer is supplement.
C. sharpen a cutting edge
The correct answer is (B) To supplement; to make to make small but necessary additions despite difficulty and hardship. To make or obtain (a living or existence) laboriously.
Eke out comes from Middle English eken, Old English eacan (increase).
Examples of use:
- She struggled to eke out a living wage.
- He eked out an education at night by reading by candlelight.