Most effective method of bench terracing under high rainfall areas is

✅ EXPLANATION: In high rainfall areas, there is a high risk of waterlogging. Inward sloped bench terraces help prevent waterlogging by directing water towards the centre of the terrace. This water can then be used for irrigation or can be drained off from the terrace.

📌Other Options and Explanations:
🔹 Leveled bench terraces are not effective in high rainfall areas as they can lead to waterlogging.
🔹 Outward sloped bench terraces are not effective in high rainfall areas as they can cause erosion.