Select set of quantum numbers which is possible for maximum number of electrons in an atom:

The set of quantum numbers which is possible for maximum number of electrons in an atom is $n=5,m=0,s=+\frac{1}{2}$

(a) This set represents only single electrons present in 5s orbitals.

(b) This set represents maximum two electrons present in 5d orbital.

(c) This set represents one 3s, one 3p and one 3d electron. So maximum 3 such electrons are possible.

(d) 

This set represents one 5s one 5p, one 5d, one 5f and one 5g electron.
So, maximum 5 electrons are possible,