The correct answer is (c) Main Boundary Fault.
The Main Boundary Fault (MBF) is a major fault line in the Himalayas. It runs along the southern edge of the Himalayas, separating the Siwalik Hills from the Lesser Himalayas. The MBF is a strike-slip fault, meaning that it moves horizontally. It is one of the most active faults in the Himalayas, and is responsible for many earthquakes in the region.
The Trans-Himalayan Thrust (THT) is a major thrust fault in the Himalayas. It runs along the northern edge of the Himalayas, separating the Himalayas from the Tibetan Plateau. The THT is a reverse fault, meaning that it moves upwards. It is one of the most important faults in the Himalayas, and is responsible for the uplift of the Himalayas.
The Main Central Thrust (MCT) is a major thrust fault in the Himalayas. It runs along the central part of the Himalayas, separating the Lesser Himalayas from the Greater Himalayas. The MCT is a reverse fault, meaning that it moves upwards. It is one of the most important faults in the Himalayas, and is responsible for the uplift of the Himalayas.
The Himalayan Front Fault (HFF) is a major fault line in the Himalayas. It runs along the northern edge of the Indian Plate, separating the Indian Plate from the Eurasian Plate. The HFF is a strike-slip fault, meaning that it moves horizontally. It is one of the most active faults in the Himalayas, and is responsible for many earthquakes in the region.