The correct answer is: a) Agriculture.
Livestock rearing in Mizoram is often integrated with agriculture. This is because the two activities are complementary to each other. Livestock provide manure, which helps to improve soil fertility. They also provide draft power, which can be used to plow fields and transport crops. In addition, livestock can be sold for cash, which can be used to purchase agricultural inputs or other goods and services.
Fishing is not a major activity in Mizoram. The state does not have a coastline, and the rivers and streams that are present are not suitable for commercial fishing. Mining is also not a major activity in Mizoram. The state does have some mineral resources, but they are not exploited on a large scale. Tourism is a growing industry in Mizoram, but it does not have a significant impact on livestock rearing.
In conclusion, livestock rearing in Mizoram is often integrated with agriculture. This is because the two activities are complementary to each other.