The Magnetic Flux Through a Loop Is Made to Vary $\phi$

The magnetic flux through a loop is made to vary according to the relation
$\phi$ _m = 6t² + 7t + 1
Where the units are SI. The EMF induced in the loop when t = 2 s is

A) 38 V
B) 39 V
C) 40 V
D) 31 V
E) 19 V