Final answer:
The situation that would be considered sufficient consideration for a contract to exist is an exchange of value between parties.
Step-by-step explanation:
Out of the options provided, the situation that would be considered sufficient consideration for a contract to exist is An exchange of value between parties (Option C).
Sufficient consideration refers to something of value given by one party to another as a part of a contract. In a contract, both parties must provide something of value in order for it to be enforceable.
For example, if Party A promises to deliver goods or services and Party B promises to pay for them, there is an exchange of value happening, which would satisfy the requirement of sufficient consideration for a contract to exist.