Modern atomic model

Chemistry Level 1

According to the modern atomic model, what is the electron configuration of 20Ca_{20}\ce{Ca} at the ground state?

(A): 1s22s22p43s23p43d61s^2 2s^2 2p^4 3s^2 3p^4 3d^6

(B): 1s22s22p63s23p81s^2 2s^2 2p^6 3s^2 3p^8

(C): 1s22s22p63s23p81s^2 2s^2 2p^6 3s^2 3p^8

(D): 1s22s22p63s23p64s21s^2 2s^2 2p^6 3s^2 3p^6 4s^2

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