The correct answer is: Malic acid.
Malic acid is a dicarboxylic acid that is found in many fruits and vegetables, including bananas. It is responsible for the tart taste of these foods. Malic acid is also used as a food additive and in the production of pharmaceuticals.
Formic acid is a weak organic acid that is found in the venom of ants and bees. It is also used as a preservative and in the production of plastics.
Sulphuric acid is a strong mineral acid that is used in many industrial processes, including the production of fertilizers and detergents. It is also used in batteries and as a cleaning agent.
Hydrochloric acid is a strong mineral acid that is used in many industrial processes, including the production of steel and pharmaceuticals. It is also used in batteries and as a cleaning agent.
In conclusion, the primary acid present in ripe bananas is malic acid.