Which sentence has a parallel structure?
a. the internet is a great resource for personal information, research, and for playing games.
b. the teacher asked one student to come to the board, write the formula, and to solve the problem.
c. the professor told her to write her research report quickly, accurately, and thoroughly if she wanted an
a.
d. the encyclopedia can be used to look up specific information, to find historical dates, and for school reports.