[单选题]
What is the electron configuration of this orbital diagram?
A. $1s^22s^22p^3$
B. $1s^22p^32s^2$
C. $1s^22s^32p^2$
D. $1s^22s^23s^3$
参考答案: A
本题详细解析: Choice A is the correct answer because it satisfies Aufbau's principle and the number of electrons in the electron configuration aligns with the same number of electrons in the orbital diagram.
