The final product of which of the following reactions furnishes evidence that glucose has unbranched carbon chain:
A. Glucose`underset(2."Red"P+HI)overset(1."Br".H_(2)O)rarr`
B. Glucose`underset(2."Red"P+HI)overset(1.NaBH_(4))rarr`
C. Glucose `overset(1. HCN)underset(underset(3."Red P"+HI)(2.H_(3)^(o+)O))rarr`
D. Glucose`overset(CH_(3)OH,H^(oplus))rarr`
