The total no. of e^-in the ground state of argon atom, with magnitude of quantum number m=0 are--

1. 6
2. 2
3. 8
4. 10

m=0 for s orbital.
Ar has electronic configuration  1s² 2s² 2p⁶ 3s² 3p6

​Total number of electrons in s orbitals = 6 (option 1)