Answer:
A. When we were driving to Wisconsin, the car overheated.
Explanation:
Commas are the punctuation marks that are used to signify a pause in a sentence. It doesn't mean there is a necessary stop but it allows for a short stop along the sentence. It is also used in the middle of a sentence to separate ideas or themes in a sentence.
In the given sentence, the first part of the sentence is the process of driving and then the overheating happens which is a separate idea in itself but still connected to the first part. So, the correct place to put the comma will be right after the word "Wisconsin", before the next part comes.
Thus, the correct answer is option A.
