The hill station located in the Chikkamagaluru district:

Kemmangundi
Madikeri
Ooty
Nandi Hills

The correct answer is A) Kemmangundi.

Kemmangundi is a hill station located in the Chikkamagaluru district of Karnataka, India. It is situated at an altitude of 1,600 meters (5,200 feet) above sea level, and is surrounded by the Western Ghats mountain range. The town is known for its scenic beauty, and is a popular tourist destination.

Kemmangundi is a small town with a population of around 2,000 people. The town is located in the middle of a forest, and is surrounded by hills and valleys. The town has a number of hotels and restaurants, as well as a few shops.

The main attraction of Kemmangundi is its natural beauty. The town is located in a valley, and is surrounded by hills and forests. The town has a number of viewpoints, from which visitors can enjoy the views of the surrounding countryside.

Kemmangundi is also a popular destination for trekking and hiking. There are a number of trails that lead to the top of the hills, and the town is a good base for exploring the surrounding area.

Kemmangundi is a beautiful and peaceful town, and is a great place to relax and enjoy the natural beauty of Karnataka.

The other options are incorrect because they are not located in the Chikkamagaluru district.

B) Madikeri is a town in the Kodagu district of Karnataka, India. It is the headquarters of the district and is known for its coffee plantations and scenic beauty.

C) Ooty is a hill station in the Nilgiris district of Tamil Nadu, India. It is the second-highest hill station in India after Shimla, and is known for its cool climate and scenic beauty.

D) Nandi Hills is a hill station in the Ramanagara district of Karnataka, India. It is located about 60 kilometers (37 miles) from Bangalore, and is known for its temples and scenic beauty.