Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to

• A. The formation of hydrochloric acid when chlorine is added to water.
• B. The formation of hypochlorous acid when chlorine is added to water.
• C. The formation of nascent oxygenwhen chlorine is added to water.
• D. The formation of hydrogenwhen chlorine is added to water.