1. According to Newton's Third Law of Motion,
   there is an equal and opposite reaction for every
   action. Which of the following scenarios best
   illustrates this law?
   a. A person pushes a heavy box, and the box
   moves in the same direction.
   b. A bird flying in the sky.
   c. A rocket moves upward into space by pushing
   gases backward through its engine.
   d. A pencil rests on a table without any motion.