What are the factors that effect the strength of a frictional the acceleration of an object the color and density of an object the buoyant forces acting on an obeject the mass of an object and how rough te surface is

If you write down the formula for friction, you will get an answer.

Ff = u * N               Where N is a push down force that an object experiences.

                              u (mu) is a constant and has no units

It may not be accelerating and still experience friction. A is not correct.

Color and Density will not affect the frictional force. B is not so.

Buoyant forces are a different thing altogether. Generally friction has nothing to do with them. C is incorrect.

The last one is your answer. Technically mg should be the answer and not mass, but the second part is correct.

carla slowed down in the beginning of her trip, stopped, and then sped up