Context: This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.
Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe.
Complete the sentence.
In this chemical reaction, glucose is a ().
A. reactant
B. product
From the given choices, choose the correct answer and respond with the letter of that choice.

B