Final answer:
The correct answer is A. had - sat. This expresses a wish about a past action.
Explanation:
The correct answer is: A. had - sat
In this sentence, the speaker is expressing a wish about a past action that did not happen. The correct form to use in this hypothetical past situation is Past Perfect, which is formed as had + past participle. Therefore, the correct answer is A. (had - sat)
Example: I wish I had sat in the shade yesterday; I wouldn't have a headache now.
Learn more about Correct verb form for expressing wishes here:
https://brainly.com/question/39637060
