The Monthly Sales S (In Hundreds of Units)of Baseball Equipment $S = 55.7 - 37.5 \cos \frac { \pi t } { 6 }$

Multiple Choice

The monthly sales S (in hundreds of units) of baseball equipment for an Internet sporting goods site are approximated by $S = 55.7 - 37.5 \cos \frac { \pi t } { 6 }$ where t is the time (in months) ,with t = 1 corresponding to January.Determine the months when sales exceed 7700 units at any time during the month.

A) April through August
B) July through May
C) June through August
D) April through July
E) May through July