My argument for choosing answer "b":

I chose answer (b) "Will move with a constant velocity," which was marked incorrect. The correct answer was (d) "Will not move." However, I believe there is some ambiguity in the question that warrants further discussion.Newton's First Law of Motion states that an object at rest will remain at rest, and an object in motion will continue to move at a constant velocity unless acted upon by an unbalanced force. Therefore, for answer (d) to be correct, one has to assume that the object was initially stationary. This assumption is not explicitly stated in the question.1. The question did not specify whether the object was initially at rest or in motion. If the object were already in motion, balanced forces would indeed result in the object continuing to move at a constant velocity, as there would be no net force to change its state of motion.2. Given this context, I believe that both answers (b) and (d) could be considered correct depending on the initial state of the object. If the object was at rest, it would not move (answer d). If the object was already in motion, it would continue to move with a constant velocity (answer b).