Stored Potatoes, Beets, and Rutabagas Freeze at Temperatures Below Zero

Multiple Choice

Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because

A) They are good absorbers of radiant energy.
B) They are good radiators of energy.
C) The water in them contains dissolved salts and sugars.
D) They are very dense.
E) All of the the above choices are true.