Which molecule has a non-bonding (lone) pair of electrons on the central atom?

A.     \({\text{B}}{{\text{F}}_{\text{3}}}\)

B.     \({\text{S}}{{\text{O}}_{\text{2}}}\)

C.     \({\text{C}}{{\text{O}}_{\text{2}}}\)

D.     \({\text{Si}}{{\text{F}}_{\text{4}}}\)

B