Correct Answer: restore

Solution : The first option is correct.

Deplete means to reduce or exhaust the quantity or resources of something.
Restore means to bring something back to its original or normal condition, or to replenish and renew.

In the context of the sentence, the depletion of old things is described as a fancy business, suggesting that it involves selling or dealing with old items. The antonym restore fits well, as it implies bringing back or renewing old things, contrary to the depleting process described.

The meanings of the other options are:

Old: It is an adjective that generally refers to something having existed or been in use for a long time.

High: It can refer to a position or location that is situated above the ground or at a greater height

Fancy: It can describe something that is elaborate, decorative, or ornate.

Therefore, the correct antonym will be restore.