Which statement is correct about the two objects?

a
Both are traveling at a constant speed, but Object X is traveling at a faster speed than Object Y.
b
Objects X and Y are speeding up over time.
c
Objects X and Y are traveling at the same speed.
d
Neither object is traveling at a constant speed, and Object X is traveling at a slower speed than Object Y.

a. Both are traveling at a constant speed, but Object X is traveling at a faster speed than Object Y.