The net force acting on an object is the vector sum of all the forces acting on it. Since the resulting net force is -10 N, we can deduce that the forces acting on the object are in opposite directions. Therefore, we need to choose the pair of forces whose vector sum is -10 N.
Option C (-63 N and 73 N) satisfies this condition because -63 N + 73 N = 10 N in the opposite direction, which matches the resulting net force of -10 N.
Therefore, the most likely represent the forces acting on the object are -63 N and 73 N. Answer: C.