Jeopardize & Jeopardization Usage

Hi teachers,

Could you please check the following sentences, then tell me which one sounds natural?

1. He risks his life to save the drowning kid.

2. He put his life at risk to save the drowning kid.

3. He put his life in/into jeopardization to save the drowning kid.
4. He jeopardizes his life to save the drowning kid.

Thank you very much