The correct option is Khasi Hills.
Explanation
Mawsynram is recognized as the wettest place on Earth, holding the record for the highest average annual rainfall. Its specific physiographic location on the Meghalaya Plateau is the primary factor for this extreme precipitation due to the orographic effect.
Geographical Analysis:
- Khasi Hills: Mawsynram is situated on the crest of the southern range of the Khasi Hills (specifically in the East Khasi Hills district). The hills here form a funnel-shaped depression that traps moisture-laden winds from the Bay of Bengal, forcing them to rise abruptly and cause heavy rainfall.
- Garo Hills: These hills constitute the western part of the Meghalaya Plateau. While they receive significant rainfall, they are not the location of Mawsynram.
- Jaintia Hills: These hills form the eastern part of the Meghalaya Plateau.
- Mikir Hills: These are located in Assam (Karbi Anglong), separated from the Meghalaya Plateau, and are not associated with Mawsynram.
Key Takeaway: Mawsynram is located in the Khasi Hills of Meghalaya, where the funnel-shaped topography maximizes orographic rainfall from the Bay of Bengal branch of the monsoon.