Respuesta :
"b. had been a most unpleasant coincidence that the power outage had come when we had guests staying over; the entire house was full" uses a semicolon correctly because there is a long pause.
Answer:
b. It had been a most unpleasant coincidence that the power outage had come when we had guests staying over; the entire house was full.
Explanation:
When two independent clauses are joined in one sentence without a conjunction to link them; we need to use a semicolon.