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 for t > 0 by x = (t³ − 3t² + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0) ?

A) 3 m
B) 4 m
C) 8 m
D) 2 m
E) 7 m