Which One of the Following Is True of the Pentoses $\beta$

Multiple Choice

Which one of the following is true of the pentoses found in nucleic acids?

A) C-5 and C-1 of the pentose are joined to phosphate groups.
B) The pentoses are in a planar configuration.
C) The bond that joins nitrogenous bases to pentoses is an O-glycosidic bond.
D) The pentoses are always in the $\beta$ -furanose forms.
E) The straight-chain and ring forms undergo constant interconversion.