Context: When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. Then, follow the instructions below.
Dutch chocolate is a special type of chocolate that has a dark color and a mild flavor. It is made by treating chocolate with a solution of water and sodium hydroxide (NaOH). When sodium hydroxide dissolves in water, sodium ions (Na+) and hydroxide ions (OH−) form in the solution. During this process, chemical energy is converted to thermal energy, which flows into the surroundings.
Complete the statement.
During this chemical reaction, the solution becomes ().
A. colder
B. warmer
Select the correct answer from the given choices and respond with the letter of the chosen option.

B