Which of the following reactions indicates the linear structure of glucose?

• A
  $C_{6}H_{12}O_{6} \xrightarrow{(CH_{3}CO)_{2}O} \text{Glucose pentaacetate}$
• B
  $C_{6}H_{12}O_{6} \xrightarrow{HCN} \text{Cyanohydrin}$
• C
  $C_{6}H_{12}O_{6} \xrightarrow{HNO_{3}} \text{Saccharic acid}$
• D
  $C_{6}H_{12}O_{6} \xrightarrow{HI, \Delta} n-\text{hexane}$