b is the correct answer hope it help
Answer: A.
The first paragraph explains how the system functions, and the second paragraph describes how the system has succeeded.
Explanation: A because just took the question.
Answer:
<em>"</em><em>She is enrolling in swim class because of this.</em><em>"</em><em> </em> uses progressive tense verb.
A hyphen...................not sure if is this the particular answer you are looking for though