The correct answer is: d) All of the above.
Steep slopes and erosion are a major challenge to agriculture in Mizoram. The state has a hilly terrain with steep slopes, which makes it difficult to cultivate crops. The soil is also prone to erosion, which can further damage agricultural land.
Small landholdings are another challenge to agriculture in Mizoram. The average landholding size in the state is very small, which makes it difficult for farmers to make a living from agriculture.
Limited irrigation facilities are also a challenge to agriculture in Mizoram. The state receives very little rainfall, and there are limited sources of irrigation water. This makes it difficult to grow crops during the dry season.
All of these challenges make it difficult to grow crops in Mizoram. As a result, the state has a low agricultural productivity.