MC 問題---請幫忙

An ionic bond is ..
A) is formed when the a hydrogen bond already
covalently linked to one electronegative atom, binds with another
electron hungry atom to form a bridge.
B) formed when electrons shared between two or more electrons is unequally shared.
C)is a chemical bond formed by the
transfer of one or more electrons from the outermost energy level (the
valance shell) of one atom to that of the other.
D) a chemical bond where two atoms share the electrons in the outer shell.