Answer: (A) A 3s electron
Step-by-step explanation:
When identifying the orbital, we do not care about ml or ms, since they describe the properties of the electron.
An electron with a principal quantum number (n) = 3 will be either a 3s, 3p, or a 3d electron.
An electron with l = 0 will be in the s orbital.
Thus, the electron is in the 3s orbital, answer (A) is correct.