A skateboarder rides down the street. When his feet push down on the skateboard, what is the reaction force?

the skateboard pushes up

Explanation:

newton's 3rd law says for every action, there's an equal and opposite reaction, so when his feet push on the skateboard, the skateboard pushes back up.

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

option number c is the right answer.