When a p-type impurity is added in a pure semiconductor, a large number of holes are created in a p-type semiconductor. Thus, each impurity atom is deficient of one electron and they accept the electrons which are loosely bound to other neighboring atoms. So, each impurity atom acquires negative charges. The number of negatively charged impurity atoms and the number of holes are equal in p-type semiconductor. Thus, it is electrically neutral. Therefore, the correct answer is option C.