After having played three basketball games, Megan had scored an average of 18 points per game. After her fourth game, her scoring average had dropped to 17 points per game. How many points did Megan score in her fourth game?
(A) 18
(B) 17
(C) 16
(D) 15
(E) 14
Since Megan's scoring average was 18 points per game after 3 games, she must have scored $3 \times 18=54$ points over her first three games. Similarly, she must have scored $4 \times 17=68$ points over her first 4 games. So in the fourth game, she scored $68-54=14$ points.