The Daily Consumption C (In Gallons)of Diesel Fuel on a Farm

Multiple Choice

The daily consumption C (in gallons) of diesel fuel on a farm is modeled by​ $C = 30.8 + 21.6 \sin \left( \frac { 2 \pi t } { 365 } + 10.9 \right)$ , ​
Where t is the time (in days) ,with t = 1 corresponding to January 1.
What is the period of the model?
​

A) 31 days
B) 22 days
C) 183 days
D) 365 days
E) 30 days