Concept:An offer is a clear announcement indicating readiness to contract.
Explanation:In contract law, an offer is a definite proposal made by one party to another.
It shows that the offeror is willing to be legally bound on stated terms.
The announcement must be clear enough for the offeree to simply accept it.
An acceptance is the offeree's response agreeing to the offer, not the announcement itself.
Consideration is the value exchanged between the parties, such as money or services.
A proxy is a person appointed to act on behalf of another, which is unrelated to this definition.
Therefore, an announcement of willingness to enter into a contract is called an offer.
Answer:D. an offer