Could someone help and clarify which would be the best answer. I believe the answer could be A, bit I am not sure.

Yes, the answer is choice A

Explanation:

The source in a circuit, sometimes a battery, is what provides the energy. It lets out electrons at the negative end and accepts them at the positive end, leading to a flow of charge. Hope this helps!

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.