Bihar has a high population density, meaning:

The correct answer is: a) Large number of people per square kilometer.

Bihar has a population density of 1,106 people per square kilometer, which is the third highest in India. This means that there are a large number of people living in a relatively small area. This can lead to problems such as overcrowding, pollution, and a lack of resources.

Option b) is incorrect because Bihar has a high proportion of urban population. In fact, the urban population of Bihar is 11.3%, which is lower than the national average of 31.1%.

Option c) is incorrect because Bihar has a low birth rate. The birth rate in Bihar is 21.1 per 1,000 people, which is

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