Correct Answer: Both assertion and reason are true, and the reason is the correct explanation of the assertion.

Solution : The correct answer is (a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.

Dairying does contribute to the nutritional security of the rural population, and the reason for this is that it provides a source of high-quality protein and essential nutrients through milk consumption.

Milk is a valuable source of nutrition, containing essential nutrients such as proteins, carbohydrates, fats, vitamins, and minerals. It is particularly rich in high-quality protein, which is important for growth, development, and maintenance of the human body.

In rural areas, where access to diverse food sources may be limited, dairying plays a crucial role in providing a readily available and affordable source of nutrition. The consumption of milk and milk products can contribute to meeting the nutritional requirements of individuals, especially children, who require adequate protein and nutrients for proper growth and development.

Additionally, dairying also offers income-generation opportunities for rural communities, allowing them to afford a diverse and nutritious diet beyond milk consumption alone.

Therefore, the assertion that dairying contributes to the nutritional security of the rural population is true, and the reason that it provides a source of high-quality protein and essential nutrients through milk consumption is the correct explanation for this assertion.