The value of a stock increases 14 2/3 points twice in one week. The other three days the value decreases by 10 points, 8 1/3 points, and 12 2/3 points. By how many points did the value of the stock change that week?
A. 23 points
B. 13 points
C. −1 1/3 points
D. −1 2/3 points