Answer:
c. contingency contract
Explanation:
A contingency contract uses an if-then approach. It is based on the idea that if the specific goal is achieved then a defined reward will be given to the individual. Also, if the specific goal is not reached then the defined penalty will be imposed. Here, Aidan is looking to lose weight and therefore, a contingency contract based if-then plan has been made which specifies rewards for reaching weekly goals and penalties for not achieving them. Hence, the answer is contingency contract.