In a slanting hilly Indian terrain experiencing more than 200 cms of annual rainfall, the best crop to cultivate would be tea (option 4). This is because tea requires a humid climate, well-distributed rainfall, and cool temperatures to thrive. The hilly terrain helps in creating the necessary conditions for tea cultivation, as it allows for proper drainage and prevents waterlogging. Moreover, the slanting nature of the terrain helps in preventing soil erosion and facilitates better water flow. On the other hand, crops like cotton (option 1), jute (option 2), and tobacco (option 3) are not suitable for this type of terrain as they require different climatic conditions and may not be able to withstand heavy rainfall or thrive in hilly areas.