Explanation:

- Option 2: keeps

- When someone "keeps" a promise, they fulfill or honor it.

- This phrase is very common and widely recognized.

- Example: "She promised to visit and she kept her promise."

- Correct Answer

- Option 1: follows

- To "follow" can mean to obey or adhere to something, like rules or instructions.

- It's less appropriate for promises.

- Option 3: sticks

- "Stick" can mean to adhere or remain constant.

- It's usually paired with "to" as in "stick to a promise," but not commonly used alone.

- Option 4: supports

- "Support" indicates backing or giving assistance.

- It doesn't fit well with promises.