The Velocity of an Object as a Function of Time

Multiple Choice

The velocity of an object as a function of time is given by v = (12.5t − 7.2t²) + (4.3t³) .What is its acceleration as a function of time?

A) a = (12.5 − 14.4t) + (12.9t²)
B) a = (−7.2) + (4.3t)
C) a = (5.3t) + (12.9t²)
D) a = (−7.2) + (8.6t)
E) a = (−14.4t) + (4.3t²)