The correct answer is A. Citric acid.
Citric acid is a weak organic acid found in citrus fruits. It is responsible for the sour taste of lemons and other citrus fruits. Citric acid is also used as a food additive, preservative, and flavoring agent.
Acetic acid is the main component of vinegar. It is a weak organic acid with a sharp, sour taste. Acetic acid is used as a food additive, preservative, and solvent.
Oxalic acid is a strong organic acid found in many plants, including rhubarb, spinach, and beets.
It is a white, crystalline solid with a sour taste. Oxalic acid is used as a cleaning agent, rust remover, and mordant.Formic acid is the simplest carboxylic acid. It is a colorless, flammable liquid with a pungent, sour taste. Formic acid is found in the venom of ants and bees. It is also used as a preservative, solvent, and in the production of plastics.
The sour taste of lemon is due to the presence of citric acid. Citric acid is a weak organic acid that is found in citrus fruits. It is responsible for the sour taste of lemons and other citrus fruits. Citric acid is also used as a food additive, preservative, and flavoring agent.