B.(1) Rockets work on the principle of action and reaction, which is also known as Newton's third law of motion. (2) The engines of the rocket generate hot gases that fire backward. (3) An equal reaction is produced, and the rocket is pushed into space. (4) Most of the rocket’s fuel is used up in this initial stage during which an escape velocity is generated. (5) This escape velocity is required for the rocket to defy gravity and reach outer space.
As you can see in line 4 it talks about velocity, then again in line five it talks about the escape in velocity. plus i got it right for study island ;)
