The coastal region of Karnataka known for its unique cuisine:

Konkan
Malabar
Coromandel
Tulu Nadu

The correct answer is: B) Malabar.

The Malabar region is a coastal region in the Indian state of Kerala and the southern state of Karnataka. It is known for its unique cuisine, which is a blend of Indian, Arabian, and Portuguese influences. Some of the most popular dishes from the Malabar region include fish curry, appam, and stew.

The Konkan region is a coastal region in the Indian states of Maharashtra, Goa, and Karnataka. It is known for its seafood dishes, such as prawn curry and fish fry.

The Coromandel region is a coastal region in the Indian states of Tamil Nadu, Andhra Pradesh, and Puducherry. It is known for its rice dishes, such as idli and dosa.

Tulu Nadu is a region in the Indian state of Karnataka. It is known for its Tulu language and culture. The cuisine of Tulu Nadu is a blend of Indian and Portuguese influences. Some of the most popular dishes from Tulu Nadu include bisi bele bath, ragi mudde, and neer dosa.