Explanation

Option A is correct: The Agasthyamala Biosphere Reserve, located at the southern end of the Western Ghats straddling Kerala and Tamil Nadu, encompasses:

– Kerala portion: Neyyar Wildlife Sanctuary, Peppara Wildlife Sanctuary, and Shendurney Wildlife Sanctuary.
– Tamil Nadu portion: Kalakad Mundanthurai Tiger Reserve (KMTR).
– Option B is incorrect: Mudumalai, Sathyamangalam, Wayanad, and Silent Valley form parts of the Nilgiri Biosphere Reserve.
– Option C & D are incorrect: Comprise sanctuaries located in Andhra Pradesh and Telangana.

Therefore, the correct group is Option A.