Context: This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.
Hydrogen peroxide, a household disinfectant, breaks down into water and oxygen gas over time. Light speeds up this process, so hydrogen peroxide is typically stored in a dark-colored bottle. The bottle's dark coloring blocks light and makes the hydrogen peroxide last longer.
Complete the sentence.
In this chemical reaction, water is a ().
A. reactant
B. product
From the given choices, select the correct answer and reply with the letter of the chosen option.
Answer: B