Challenges to dairy development in Manipur include:

Low milk yields
Lack of processing facilities
Inadequate cold chain infrastructure
All of the above

The correct answer is: All of the above.

Low milk yields: The average milk yield per cow in Manipur is only 1.5 liters per day, which is much lower than the national average of 2.5 liters per day. This is due to a number of factors, including poor nutrition, disease, and lack of access to quality breeding stock.

Lack of processing facilities: There are only a few small dairy processing plants in Manipur, and they are not able to meet the demand for dairy products. This means that much of the milk produced in the state is either consumed fresh or sold to neighboring states.

Inadequate cold chain infrastructure: The cold chain infrastructure in Manipur is not well-developed, which means that milk cannot be stored or transported for long periods of time. This limits the market for dairy products and makes it difficult to export them.

These challenges have hampered the development of the dairy industry in Manipur. In order to address these challenges, the government needs to invest in improving the quality of livestock, providing farmers with access to quality breeding stock, and developing cold chain infrastructure.