Editor
The electronic configuration of carbon in excited state is:
Difficulty: Hard
A: 
$1s^{2}.2s^{2}.2p^{2}$
B: 
$1s^{2}.1s^{1}.2p^{3}$
C: 
$1s^{2}.2s^{2}.2p^{1}3s^{1}$
D: 
$1s^{2}.2s^{1}.2p.2p.2p$