Which of the Following Statements Contrasting Covalent Bonds and Ionic

Which of the following statements contrasting covalent bonds and ionic bonds is correct?

A) Covalent bonds usually involve two nonmetals and ionic bonds usually involve two metals.
B) Covalent bonds usually involve two metals and ionic bonds usually involve a metal and a nonmetal.
C) Covalent bonds usually involve a metal and a nonmetal and ionic bonds usually involve two nonmetals.
D) Covalent bonds usually involve two nonmetals and ionic bonds usually involve a metal and a nonmetal.