Will two things push on each other with the same amount of force if they are different masses?

No, they will not if for example, you have a semi-truck with a car and both put the acceleration then the semi would weigh more than the car weighs less meaning that the semi-truck would have the upper hand and end up pushing the car further than the time it takes for the car to push the semi-truck.

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NO

Explanation:

because if one thing is heavier then the other then they cant counteract each other

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

this could be newton#'s law of cooling. the cooling curve is exponential