Answer: C.sentence 3
In this excerpt, sentence 3 is badly structured. In order to improve fluency, the sentence would have to be rewritten. There are several ways to do this. For example, we could add a transition word that shows the relationship between different ideas (such as eventually or later). We could also separate the sentence and turn it into two separate statements. Making some changes would increase the paragraph's fluency and make it easier for us to read.