The Cost of Dig-It Brand Snow Shovels Is Given By c

Multiple Choice

The cost of Dig-It brand snow shovels is given by $c ( t ) = 3 \sin ( 2 \pi ( t - 0.75 ) )$
Where t is time in years since January 1, 1997. How fast, in dollars per year, is the cost increasing on October 30, 1997

A) $21.85 per year
B) $18.85 per year
C) $9.42 per year
D) $20.85 per year
E) $6.00 per year