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C is corrent. An incidental beneficiary is a third party whom a contract was not intended to benefit, but who nevertheless may receive an incidental benefit. An incidental beneficiary has no rights to enforce the contract which gives him those unintended benefits.
A is incorrect. The high school dropouts were not a party to the contract and were to receive only incidental benefits; therefore, they have no enforcement rights.
B is incorrect. Assignment of Harris’ contract rights is irrelevant.
D is incorrect. Long is an incidental beneficiary who has no rights to enforce the contract. Only creditor and donee beneficiaries are able to enforce a contract.