The hill station known for its coffee plantations:

Munnar
Coorg
Chikkamagaluru
Ooty

The correct answer is A) Munnar.

Munnar is a town in the Idukki district of Kerala, India. It is a popular tourist destination known for its tea and coffee plantations, hills, and valleys. The town is located in the Western Ghats mountains and is surrounded by forests. Munnar is a popular destination for trekking, hiking, and camping.

Coorg is a district in the state of Karnataka, India. It is known for its coffee plantations, hills, and valleys. The district is located in the Western Ghats mountains and is surrounded by forests. Coorg is a popular destination for trekking, hiking, and camping.

Chikmagalur is a district in the state of Karnataka, India. It is known for its coffee plantations, hills, and valleys. The district is located in the Western Ghats mountains and is surrounded by forests. Chikmagalur is a popular destination for trekking, hiking, and camping.

Ooty is a town in the Nilgiris district of Tamil Nadu, India. It is a popular tourist destination known for its tea plantations, hills, and valleys. The town is located in the Western Ghats mountains and is surrounded by forests. Ooty is a popular destination for trekking, hiking, and camping.

However, Munnar is the only hill station among the given options that is known for its coffee plantations.