[单选题]
In a $CO_2$ molecule, how many lone and bonding pairs of electrons are present in the Lewis-dot structure?
A. Lone pairs of electrons is 4;Bonding pairs is 4
B. Lone pairs of electrons is 2;Bonding pairs is 6
C. Lone pairs of electrons is 4;Bonding pairs is 2
D. Lone pairs of electrons is 2;Bonding pairs is 8