The correct answer is A. Dharamshala.
Dharamshala is the rainiest place in Himachal Pradesh, with an average annual rainfall of 2,500 mm. The city is located in the foothills of the Himalayas, and its location makes it susceptible to monsoon rains. The monsoon season in Dharamshala runs from June to September, and during this time the city receives the majority of its annual rainfall.
The other options are incorrect because they are not as rainy as Dharamshala. Chamba receives an average annual rainfall of 1,500 mm, Una receives an average annual rainfall of 1,200 mm, and Bilaspur receives an average annual rainfall of 1,000 mm.
Dharamshala is a popular tourist destination, and its rainy weather is one of the things that makes it so attractive. The city is surrounded by lush forests, and the monsoon rains help to keep the landscape green and vibrant. The rain also provides a welcome relief from the heat of the summer months.
If you are planning a trip to Dharamshala, be sure to pack your rain gear! The city receives a lot of rain, but it is a beautiful place to visit any time of year.