In the correct Lewis dot structure of `CO_(2)`, the total number of lone pairs are :
A. `:overset(..)(O)::C::overset(..)(O):`
B. `:underset(..)overset(..)(O):overset(..)(C)::overset(..)(O):`
C. `:overset(..)(O)::C:underset(..)overset(..)(O):`
D. `:underset(..)overset(..)(O):C:underset(..)overset(..)(O):`