The correct answer is option 3, West Bengal. The Buxa Tiger Reserve is a protected area and a tiger reserve located in the northern part of West Bengal. It covers an area of around 760 square kilometers and is situated in the Buxa Hills of the Eastern Himalayas. The reserve is known for its rich biodiversity and is home to various species of animals, including the Royal Bengal tiger. It is also an important elephant corridor and provides habitat for elephants, leopards, clouded leopards, Indian bison, and many other wildlife species. Additionally, the reserve is known for its scenic beauty, with picturesque landscapes, dense forests, and various trekking trails for adventure enthusiasts.