Explanation:

- Jeopardy is a noun that means exposure to danger or risk. It refers to a situation where there is a threat of harm or damage.

- Option 1: Promotion refers to the act of elevating someone to a higher rank or position, or supporting something. It is often used in the context of career advancement or marketing.

- Option 2: Prevention is about stopping something from happening or avoiding a risk. It involves taking measures to stop a harmful event or condition.

- Option 3: Peril means serious and immediate danger. It is a state where one is exposed to risk, similar to jeopardy.

- Option 4: Protection involves safeguarding someone or something from harm or damage. It refers to actions taken to prevent danger.

The most appropriate synonym of "jeopardy" is Option 3: Peril.