Which set of quantum numbers $\left(n, l, m_l, m_s\right)$is permissible for an electron in an atom?

The  set of quantum numbers $\left(n, l, m_l, m_s\right)$is permissible for an electron in an atom $1, 0, 0, -\frac{1}{2}$.

For every number of n, the range for l is 0 to (n-1), the range for m is l to +l, and the range for spin is either +21 or 21.

Hence, the option A is correct.