Correct option is D
The Manas Biosphere Reserve is located in the state of Assam, India. It is a UNESCO World Heritage Site.
First National Park in India: -Hailey National Park is the oldest national park in India, now known as Jim Corbett national park.
Largest National Park in India: -Hemis National Park is the biggest national park in India, located in Ladakh,
Floating National Park in India: -Keibul Lamjao National Park is a floating national park, located in Manipur
Smallest National Park in India: -South Button Island National Park in Andaman and Nicobar Islands