The correct answer is option 2, which states that the staple food of the Vedic Aryans was milk and its products. This means that milk, along with its derivatives such as curd, butter, and ghee, formed a significant part of their diet. Milk was obtained from cattle that were an integral part of their society and economy. It was not only consumed as a beverage but also used in the preparation of various dishes. The Vedic Aryans valued and relied heavily on milk and its products for their nourishment and sustenance. It is important to note that while other food items like barley, rice, pulses, vegetables, and fruits may have been consumed by the Vedic Aryans, these were not their primary staple food.