The rice is cooked more quickly in a pressure cooker because A. It is covered. B. Less quantity of water is used. C. None of these D. Water boils at a higher temperature under pressure.

The correct answer is D. Water boils at a higher temperature under pressure.

When water is heated, it turns into steam. This process is called boiling. The boiling

point of water is 100 degrees Celsius at sea level. However, the boiling point of water increases as the pressure increases. This is because the higher pressure prevents the water molecules from escaping into the air as easily.

In a pressure cooker, the pressure is increased by trapping the steam inside the cooker. This raises the boiling point of water, which allows the food to cook more quickly.

Option A is incorrect because the rice is cooked more quickly in a pressure cooker even if it is not covered.

Option B is incorrect because the amount of water used does not affect the cooking time in a pressure cooker.

Option C is incorrect because the rice is cooked more quickly in a pressure cooker even if the water is not boiling.