Reflex actions are caused by the -brain -vertebrae -spinal cord

The spinal cord sends messages to the muscles when to contract  ;so spinal cord would be your answer.

the answer is true because it was true

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.