Answer:
b) Moral hazard
Step-by-step explanation:
This is an example of a moral hazard. Moral hazard occurs when a party that has entered into a contract changes its behaviour after the contract is signed, leaving the other party worse off. It can also occur when a party does not enter into a contract in good faith from the beginning. In this case, Nick changed his behaviour after purchasing the insurance, which leaves the insurance company in a worse position as Nick's risk has increased.