Which of the following statements about Newton's first law of motion is correct? a) An object will accelerate if a force is applied to it. b) An object at rest will remain at rest unless acted upon by an unbalanced force. c) Force is equal to mass times acceleration. d) For every action, there is an equal and opposite reaction.

Which of the following statements about Newton's first law of motion is correct? a) An object will accelerate if a force is applied to it. b) An object at rest will remain at rest unless acted upon by an unbalanced force. c) Force is equal to mass times acceleration. d) For every action, there is an equal and opposite reaction.