Assertion : The charge on body can be increased or decreased in terms of electronic charge $e$ .

Reason : Quantization of charge means that the charge on a body is the integral multiple of electronic charge $e$ .

All the observable charges have to be integral multiple of $e$ . Thus if a body contains $n_1$ electrons and $n_2$ protons, the total amount of charge on the body is $n_{2}e + n_1(-e) = (n_2-n_1) e .$ Since $n_1$ and $n_2$ are integers, their difference is also an integer. Thus the charge on any body is always an integral multiple of $e$ and can be increased or decreased in terms of $e$ .