B. It was an isolated incident. There was no reason to believe there'd be another attack.
If you read the sentence out loud, you'll be able to know which sentence is the right one..
1st one does not make sense
So doesn't the third and the fourth one
So your answer is most likely to be the second one or
B. To get rid of pesky ants, there are three main steps to follow.
Between the buildings and I got scared
