[单选题]
Covalent bonding is )wtg8+ +-ypk lk zk 1qb)7ve3bhuch f3l ,p glc,ca(b 2n7c:rqcaused by
A. the sharing of electrons between atoms.
B. the transfer of electrons between atoms.
C. unequal charge distributions around neutral molecules.
D. atoms bonding to hydrogen molecules.