Final answer:
1) Insurance contract is the correct answer, as it involves indemnification for financial losses due to unknown events. Insurance helps protect against financial loss, with various types like health, car, and house insurance.
Step-by-step explanation:
The contract that involves one party indemnifying another when a loss arises from an unknown event is an insurance contract. Insurance is a method of protecting a person from financial loss, by having policyholders make regular payments to an insurance entity; the insurance firm then compensates a member who suffers significant financial damage from an event covered by the policy. This can include a variety of different types of insurance, such as health insurance, car insurance, house or renter's insurance, and life insurance. An important aspect to consider is the concept of moral hazard, which occurs when people with insurance are less likely to guard against a risk occurring because they know they are covered.