What is the difference between nucleosides and nucleotides?

A) Only nucleotides have nitrogenous bases.
B) Only nucleotides contain a phosphate group.
C) Nucleotides have the pentose sugar ribose,whereas nucleosides have the pentose sugar deoxyribose.
D) In nucleosides the monomers are joined by phosphodiester bonds;in nucleotides the monomers are joined by hydrogen bonds.
E) Nucleosides are the monomers of DNA,whereas nucleotides are the monomers of RNA.