The humidity levels in Bihar are generally:

The correct answer is: b) High.

Bihar is a state in eastern India. It is the third-most populous state in India, with a population of over 100 million people. The state is located in the Gangetic plain, and has a tropical climate. The average temperature in Bihar ranges from 20°C to 40°C. The humidity levels in Bihar are generally high, especially during the monsoon season. The monsoon season in Bihar lasts from June to September, and during this time, the humidity levels can reach up to 90%. The high humidity levels can make it difficult to breathe, and can also lead to skin problems and other health issues.

The other options are incorrect for the following reasons:

• Option a) is incorrect because the humidity levels in Bihar are generally high.
• Option c) is incorrect because the humidity levels in Bihar are not variable depending on season. The humidity levels are high throughout the year, but they are highest during the monsoon season.
• Option d) is incorrect because humidity does exist in Bihar. The humidity levels in Bihar are generally high.