Explanation:

- "Pull the plug" means to stop or discontinue something. It originates from the idea of pulling a plug on an electrical device to stop its operation.

- Option 1: End something - This is correct. It relates directly to stopping or terminating an activity or project.

- Option 2: Distract someone - This refers to diverting someone's attention, which doesn’t relate to the idiom.

- Option 3: Launch something - This means to start or initiate, which is opposite in meaning to the idiom.

- Option 4: Annoy someone - This involves causing irritation, which is unrelated to the idiom’s meaning.