6. 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.