The correct answer is: b) Cows.
Dairy farming is an important source of livelihood in Sikkim, with a focus on cows. The state has a large population of cows, which are used for milk production, as well as for meat and leather. The dairy industry in Sikkim is well-developed, and there are a number of large dairy farms in the state. The milk produced by Sikkim cows is of high quality, and is in demand both within the state and outside.
Buffaloes are also raised in Sikkim, but they are not as common as cows. Buffalo milk is thicker and richer than cow’s milk, and is used to make a variety of dairy products, such as cheese and butter.
Goats and sheep are also raised in Sikkim, but they are not as important as cows or buffaloes. Goat meat is a popular dish in Sikkim, and sheep are raised for their wool.
In conclusion, dairy farming is an important source of livelihood in Sikkim, with a focus on cows. The state has a large population of cows, which are used for milk production, as well as for meat and leather. The dairy industry in Sikkim is well-developed, and there are a number of large dairy farms in the state. The milk produced by Sikkim cows is of high quality, and is in demand both within the state and outside.