Which BEST compares the motions of dots C and D?

Question

Responses
A Both C and D are speeding up.Both C and D are speeding up.
B Both C and D are moving at a constant velocity.Both C and D are moving at a constant velocity.
C C is speeding up and D is moving at a constant velocity.C is speeding up and D is moving at a constant velocity.
D C is slowing down and D is moving at a constant velocity.

Answer 1

C C is speeding up and D is moving at a constant velocity.