Option 1: The undulating relief and hard rocks - This option suggests that the undulating relief and hard rocks in Peninsular India are a reason for practicing tank irrigation. Tank irrigation is a system where rainwater is stored in man-made reservoirs or tanks to be used for irrigation. The undulating relief and hard rocks can affect the natural flow of water, making it difficult for water to reach the fields. Therefore, tank irrigation is practiced to collect and store rainwater in the tanks which can then be used for irrigation.

Option 2: Little percolation of rainwater due to impervious rock structure - This option states that the impervious rock structure in Peninsular India is a reason for practicing tank irrigation. Impervious rocks do not allow water to seep through and percolate into the ground. As a result, rainwater does not get absorbed by the soil, and tank irrigation becomes necessary to collect and store water for irrigation purposes.

Option 3: Most of the rivers of Peninsular India are perennial - This option suggests that the reason for practicing tank irrigation is not related to the perennial nature of rivers in Peninsular India. Perennial rivers are those that flow throughout the year, providing a reliable source of water for