Under the doctrine of prevention, a party's entitlement to performance can be triggered when:

• A. If the other party prevents the occurrence of the condition, the promise becomes enforceable.
• B. If the other party aids the occurrence of the condition, the promise becomes enforceable.
• C. If the other party delays the occurrence of the condition, the promise fails.
• D. If the other party neglects to perform, the contract is void.

Answer: (A)