Answer:
The answer to your question would be that, in order to imply a causal relationship between the second and third sentence, the syntax of the original sentences might be varied in the following way: I have a wife and seven children, and I am going insane. (B)
Explanation:
The inclusion of the coordinator and creates a cause-and-effect relationship between the second and third sentence. It establishes that the reason why Bob Jackson is going insane is because he was a wife and seven children.
