To Maintain an Automobile in Approximately Constant Acceleration, Its Engine $\times$

To maintain an automobile in approximately constant acceleration, its engine must develop power that increases with time. Suppose that in one situation the work done by an engine is given by
W = 7000t² + 40,000t + 100,000
Where the units are SI. The power developed by this engine at t = 2 s is

A) 3.4 $\times$ 10⁴ W
B) 6.8 $\times$ 10⁴ W
C) 1.0 $\times$ 10⁵ W
D) 2.1 $\times$ 10⁵ W
E) 3.0 $\times$ 10⁵ W