The correct answer is: a) Khordha, Puri, Ganjam.
Chilika Lake is the largest coastal lagoon in India and the second largest in the world. It is spread across parts of three districts in Odisha: Khordha, Puri, and Ganjam. The lake is a major tourist destination and is also an important wetland for birds and other wildlife.
Option b) is incorrect because Nayagarh district is not one of the three districts that Chilika Lake is spread across.
Option c) is incorrect because Cuttack district is not one of the three districts that Chilika Lake is spread across.
Option d) is incorrect because Jagatsinghpur district is not one of the three districts that Chilika Lake is spread across.