Jack recorded the amount of time he studied the night before each of 4 history quizzes and the score he got on each quiz. The data are in the table below.

Score	Time (min.)
86	45
70	15
90	40
78	35

Use linear regression to estimate the score Jack would get if he studied for 20 minutes.

A. 71
B. 72
C. 73
D. 74
E. 75