Which electronic configuration for oxygen is correct according to Hund’s rule of multiplicity

Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity

A
$1 s^{2}, 2 s^{2} 2 p_{x}^{2} 2 p_{y}^{1} 2 p_{x}^{1}$
B
$1 s^{2}, 2 s^{2} 2 p_{x}^{2} 2 p_{y}^{2} 2 p_{z}^{0}$
C
$1 s^{2}, 2 s^{2} 2 p_{x}^{3} 2 p_{y}^{1} 2 p_{x}^{0}$
D
None of these

Solution:

Hund's rule states that pairing of electrons in the orbitals of a subshell (orbitals of equal energy) starts when each of them is

singly filled.

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