Respuesta :
The best answer among the choices provided by your question is the third choice or letter C. The form of contract both Aaron and Donald entered into is a unilateral contract. Unilateral contract is when both person agrees to the condition of the same contract.
The form of contract have both, Aaron and Donal, entered into is unilateral contract. In a unilateral contract, one party pays the other party to perform a certain duty. If the first party fulfills the duty, the second party is obligated to transfer the specified funds. However, the first party is under no binding obligation: they only have to fulfill the task if they want to.