The correct answer is B. Kaimur.
Udaypur Wildlife Sanctuary is located in the Kaimur district of Bihar. It is a hilly area with a dense forest cover. The sanctuary is home to a variety of wildlife, including tigers, leopards, elephants, and deer. It is also a popular tourist destination.
The other options are incorrect. West Champaran is a district in the northern part of Bihar. Bhojpur is a district in the central part of Bihar. Banka is a district in the southern part of Bihar. None of these districts have a wildlife sanctuary named Udaypur.