A turbine blade rotates with angular velocity ? (t) = 2.00 rad/s⁻².1.00 rad/s³t² . What is the angular acceleration of the blade at t = 9.10 s?

a) -38.2 rad/s²
b) -19.1 rad/s²
c) -36.2 rad/s²
d) -86.0 rad/s²
e) -172 rad/s²