The correct answer is (a) Kaziranga.
Kaziranga National Park is a national park in the Golaghat, Karbi Anglong and Nagaon districts of the Indian state of Assam. It is the largest national park in India and is known for its large population of Indian one-horned rhinoceroses. The park is also home to tigers, elephants, gaurs, and other wildlife.
Manas National Park is a national park in the Manas district of Assam, India. It is a UNESCO World Heritage Site and is known for its biodiversity. The park is home to tigers, elephants, rhinoceroses, and other wildlife.
Orang National Park is a national park in the Darrang district of Assam, India. It is the smallest national park in Assam and is known for its population of hoolock gibbons. The park is also home to tigers, elephants, and other wildlife.
Nameri National Park is a national park in the Sonitpur district of Assam, India. It is a relatively new national park and is known for its population of tigers. The park is also home to elephants, rhinoceroses, and other wildlife.
In conclusion, Kaziranga National Park is the national park in Assam that boasts a high density of tigers.