Answer
In graph (A), the particle is (c) slowing down.
In graph (B), the particle is (b) speeding up and then slowing down.
In graph (C), the particle is (d) slowing down and then speeding up.
In graph (D), the particle is (a) speeding up.
Work Step by Step
In graph (A), the particle is (c) slowing down.
In graph (B), the particle is (b) speeding up and then slowing down.
In graph (C), the particle is (d) slowing down and then speeding up.
In graph (D), the particle is (a) speeding up.