Answer: Option (a) is the correct answer.
Step-by-step explanation:
A reference point is defined as the point which represents motion or movement of an object from one point to another.
For example, an object A is initially present at position X and after sometime it is moved to position Y.
This means that position of the object has changed now. This represents a reference point.
Thus, we can conclude that if a reference point changes the position of the object changes.