By dint of his labour, he . . . . . . . . all that he had lost.

The correct answer is: A. replenished.

To replenish something means to make it full again. In this case, the man is working hard to make up for what he has lost.

The other options are incorrect because they do not mean to make something full again.

• Restore means to bring something back to its original condition.
• Refurbish means to make something look new again.
• Resound means to make a loud, echoing sound.