The correct option is D 3
The number of unpaired electrons present in the first excited state of the chlorine atom is 3. The electronic configuration of chlorine is [Ne]3s23p2x3p2y3p1z. Thus, it contains 1 unpaired electron. In the first excited state, 1 electron is transferred from 3p to 4s orbital. The electronic configuration becomes [Ne]3s23p2x3p1y3p1z4s1 Thus, three unpaired electrons are present in the excited state.