There are advantages and disadvantages to using e-mail. One advantage is that e-mail is very fast. It is also a
good way to stay in touch with family and friends. One disadvantage of e-mail is that it is easy to make mistakes.
In addition e-mail is less personal than a phone call.
The underlined sentence is the ......
Answer A. first supporting sentence
B. concluding sentence
C. topic sentence
D. second supporting sentence