Which of the following motions has the largest magnitude of acceleration? Assume that all objects are moving in a straight line with constant acceleration.

A

A bus moving with an initial velocity $$72\,\mathrm{km/h}$$ comes to rest in $$2.50\,\mathrm{s}$$

B

A rock during its free fall near the earth surface

C

A car accelerates from rest to $$108\,\mathrm{km/h}$$ in $$4.00\,\mathrm{s}$$

D

A train, starting from rest, takes $$6.00\,\mathrm{s}$$ to cover a distance of $$216\,\mathrm{m}$$