The water level in Lake Siscal dropped 6 3/4 inches in the fall. In the winter, the level rose 4 2/3 inches. Which expression shows one way to calculate the total change in the water level in inches during the fall and winter?
A. -6 3/4 + 4 2/3
B. -6 3/4 - 4 2/3
C. 6 3/4 + 4 2/3
D. 6 3/4 - 4 1/3