Answer:
C. Steve's reference point
Step-by-step explanation:
Reference point is a body that we adopt as a reference to analyze a given phenomenon. The reference we adopt most often is the earth. Rest happens whenever a body does not change its position relative to a given reference.
In this case, if Barry is moving faster than Steve, we can conclude that the point of reference for Barry's speed is Steve's reference point, since we are comparing Barry's speed to where Steve is. So it would be correct to say "Barry is moving faster than Steve."