Bihar has a significant population of:

Yaks
Camels
Pigs
Horses

The correct answer is: c) Pigs.

Bihar has a significant population of pigs. In fact, it is the state with the highest population of pigs in India. According to the 2011 census, there were over 10 million pigs in Bihar. This is more than the population of pigs in any other state in India.

Pigs are raised in Bihar for their meat and for their manure. The meat of pigs is a popular food in Bihar, and it is often used in dishes such as biryani and curry. The manure of pigs is used as a fertilizer in agriculture.

The population of pigs in Bihar has been increasing in recent years. This is due to a number of factors, including the increasing demand for pork, the increasing availability of feed, and the increasing availability of land for pig farming.

The increasing population of pigs in Bihar has raised some concerns about the environment. Pigs are known to be a major source of pollution, and they can also carry diseases that can be harmful to humans. However, the government of Bihar has taken steps to address these concerns, and it is working to ensure that the pig population is managed in a sustainable way.

The other options are incorrect because:

  • Yaks are not found in Bihar. They are found in the Himalayan mountains.
  • Camels are not found in Bihar. They are found in the desert regions of India.
  • Horses are not found in Bihar in large numbers. They are found in some parts of the state, but they are not as common as pigs.