The six-membered cyclic structure of glucose is called pyranose structure (α– or β–), in analogy with pyran. Pyran is a cyclic organic compound with one oxygen atom and five carbon atoms in the ring. The cyclic structure of glucose is more correctly represented by Haworth structure

C2 and C3OH are cis. C3 and C4 are anti to each other.
So,the correct option is B.




