We should know that opposite charges attract. This is just something that we observe from nature.
color(red)("C. Wrong") Like charges, as in two (+) charges or two (-) charges, will repel each other. If you bring any like charges closer together, their potential energy increases. Since their potential energy increases, this indicates that you would have had to put in work to bring them closer to each other, as they naturally would not do so.
color(red)("B. Wrong") The magnitude of the charges have nothing to do with attraction and repulsion.
color(red)("D. Wrong") Again, even if charges were unequal in magnitude, this would not have any effect on whether two charges feel an attractive or repulsive force.
