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.
Pickling is used to prevent foods such as meat and vegetables from spoiling too soon. Food that has been pickled may remain edible for more than a year! One type of pickling involves soaking the food in a solution of water and sodium chloride (NaCl). When sodium chloride is dissolved in water, sodium ions (Na+) and chloride ions (Cl−) form in the solution. During this process, a small amount of thermal energy is taken in from the surroundings.
Complete the statement.
During this chemical reaction, the solution becomes ().
A. colder
B. warmer
Pick the correct answer from the listed options and provide the letter of the selected option.

A