Which solution is used by Technician A to clean a battery?

Using a solution of baking soda and water to clean a battery is effective due to the chemical properties of baking soda, which is a mild alkaline substance. When a battery has corrosion, particularly around the terminals, it is often due to the buildup of sulfate or acid residues. The baking soda reacts with the acid from the corrosion, neutralizing it and making it easier to clean off.

The mixture is typically made by dissolving a few tablespoons of baking soda in water, creating a paste or solution that can be applied with a brush to the corroded areas. This method is safe and affable, as it helps to prevent the spread of corrosive materials and does not create additional harmful reactions.

Other options, while they may have cleaning properties, do not provide the same benefits for dealing with battery corrosion. For instance, soap and water, and detergent and water may clean surfaces but lack the specific neutralizing effect needed for battery terminals. Soda and vinegar create a chemical reaction, but vinegar's acidity may damage the battery further instead of effectively cleaning it. Therefore, a baking soda and water solution stands out as the most suitable choice for this task.