Question

What is this ???????????

Answer 1

The heavier an object the harder it is to move.

Explanation:

I'm pretty sure this is it

Answer 2

C. Gravity and Friction combine to make a train hard to move.

Explanation:

This option makes the most sense based off of the text. In the text it says "Since gravity and friction make trains harder to move...." None of the other options really match the text either.

Hope it helps!