Explanation:

- Guru Gangadhar Pradhan was a renowned dancer, choreographer, and teacher mainly associated with the classical dance form of Odissi.

- Option 3: Odissi - This is the correct answer. Odissi is one of the major classical dance forms of India, originating from the state of Odisha. Guru Gangadhar Pradhan significantly contributed to its popularization and development.

- Option 1: Manipuri - This classical dance form originates from the northeastern Indian state of Manipur, characterized by its graceful movements. Guru Gangadhar Pradhan is not primarily associated with this dance form.

- Option 2: Kathakali - A highly stylized classical Indian dance-drama noted for its elaborate costumes and masks, originating from Kerala. Not related to Guru Gangadhar Pradhan’s expertise.

- Option 4: Kathak - A classical dance from North India known for its rhythmic footwork and spins. Guru Gangadhar Pradhan is not primarily linked to Kathak.