The correct answer is: c) Scavenging system.
A scavenging system is a traditional method of pig rearing in Mizoram. In this system, pigs are allowed to roam freely and forage for food. They are often kept in small groups and are not given any special care or attention. This system is relatively low-cost and labor-intensive, but it can be difficult to control the health and welfare of the pigs.
A sty system is a more modern method of pig rearing. In this system, pigs are kept in individual stalls or pens. They are fed a prepared diet and are given access to fresh water. This system is more expensive and labor-intensive than a scavenging system, but it allows for better control of the health and welfare of the pigs.
A deep litter system is a type of sty system in which the pigs are kept on a deep layer of straw or other bedding material. This system helps to keep the pigs clean and dry, and it also provides them with a place to root and forage.
A battery cage system is a type of intensive pig rearing system in which pigs are kept in individual cages. This system is the most efficient way to raise pigs, but it has been criticized for being inhumane.
In conclusion, the traditional method of pig rearing in Mizoram is a scavenging system. This system is relatively low-cost and labor-intensive, but it can be difficult to control the health and welfare of the pigs.