[单选题]
A neutral atom has an electrox26.av lxv g;cn cona5u9,sa ub fx4figuration of $1s^22s^22p^6$. If a neutral atom holds one additional electron, what is the ground state configuration?
A. $1s^22s^22p^63s^1$
B. $1s^22s^22p^7$
C. $1s^22s^32p^6$
D. none of the given answers