At an auction,acceptance occurs when:

A) the auctioneer strikes the goods off to the highest bidder.
B) an auction begins.
C) a bid is placed.
D) the auctioneer calls for the last bid.

Acceptance

In contract law, an expression of agreement to the terms of an offer that results in a binding contract between the parties.

Auctioneer

A person or entity that conducts sales in which goods or property are sold to the highest bidder.

Highest Bidder

the person or entity that offers the highest price in a bidding process, such as an auction, and is typically awarded the item or contract up for bid.