The hill station in Karnataka known for its pleasant weather and botanical gardens:

Ooty
Coorg
Munnar
Nandi Hills

The correct answer is: B) Coorg.

Coorg is a hill station in Karnataka known for its pleasant weather and botanical gardens. It is located in the Western Ghats mountains and is known for its coffee plantations, forests, and wildlife. The town of Madikeri is the main tourist destination in Coorg.

Ooty is a hill station in Tamil Nadu known for its pleasant weather and tea plantations. It is located in the Nilgiri Hills mountains and is known for its colonial architecture, lakes, and gardens.

Munnar is a hill station in Kerala known for its pleasant weather and tea plantations. It is located in the Western Ghats mountains and is known for its tea plantations, forests, and wildlife.

Nandi Hills is a hill station in Karnataka known for its temples and views of Bangalore. It is located in the Nandi Hills range of mountains and is known for its temples, waterfalls, and views of Bangalore.