Answer: The correct answer is Option B.
Step-by-step explanation:
Glucose is an organic compound which is made up of carbon, oxygen atom hydrogen atoms. The chemical formula of glucose is

This compound contains 2 types of functional groups, which are alcohol and aldehyde.
Because of the presence of these two functional groups, the molecule undergoes inter molecular reaction to form hemiacetal. During this process, water is released.
The hemiacetal form of the molecule is known as ring form of glucose which is made up of 5 carbon atoms and 1 oxygen atom.
Hence, the correct answer is Option B.