With that push, they have accelerated their masses, which means they have of their bodies. a.) changed the velocity b.) changed the masses c.) changed the internal structure d.) changed the color

As per Definition of acceleration we know that rate of change in velocity of object is known as acceleration

so when we apply push on an object that push or applied force will change the velocity of object always

so correct answer must be

a.) changed the velocity

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

reserve is the answer