Fructose and Galactose All Have the Same Six Carbon Atoms,twelve

Fructose and galactose all have the same six carbon atoms,twelve hydrogen atoms,and six oxygen atoms,just as glucose.A friend of yours says to you,"Since two of those sugars have the same number of atoms,they should all have the same name." You answer,"Yes.They do have the same atoms and the numbers are the same;however,

A) they are all polysaccharides and have slightly different functions within organisms and therefore have different names."
B) they are named differently because of their quaternary structures,which is very important in carbohydrates,especially glucose."
C) they are named differently because when heated above their optimal temperature they become denatured and will not react with their substrates."
D) they are named differently because they are involved in different DNA nucleotide formation."
E) they are named differently because they are alternate forms of the monosaccharide,glucosE."