Explanation:

- The idiom "Tit for tat" means retaliating in kind or engaging in a counteraction.

- It implies a situation where one person responds to another’s actions with a similar action.

Options Explanation:

1. Prepare to leave: This option is about getting ready to depart, not related to retaliation.

2. A wild guess: Making an assumption without much information, unrelated to the concept of retaliation.

3. Counter attack: This option is correct as it aligns with responding to an action with a similar one, which is what "Tit for tat" means.

4. Go smoothly: This means proceeding without issues or interruptions, again unrelated to retaliation.