Answer:
The mass remains the same.
Step-by-step explanation:
Unbalanced forces are the type of forces in which the system moves in a particular direction. There is some net force which acts on it.
When an unbalanced force applied to an object, the object will move in the direction where maximum force is applied. There is no effect of unbalanced force on the mass of an object. Also, the mass of an object remains same at each and every locations.
So, the correct option is (c) "The mass remains the same".