The Position of a Particle as It Moves Along the X

Multiple Choice

The position of a particle as it moves along the x axis is given by x = 15e ^{- 2t} m,where t is in s.What is the acceleration of the particle at t = 1.0 s?

A) 22 m/s
B) 60 m/s
C) 8.1 m/s
D) 15 m/s
E) 35 m/s