Ms. Diez finished grading her students' tests and the grades were as follows: 81, 82, 82, 83, 83, 83, 85, 86, 86, 86, 86, 86, 87, 87, 87, 89, 89, and 90. What would be the effect on the grade distribution if a student who was sick scored a 50 on the make up test the next day?

A. The center of the distribution would be shifted left.
B. The center of the distribution would be unaffected.
C. The center of the distribution would be shifted right.
D. The center of the distribution would be shifted, but it is impossible to predict how it would move.