The correct answer is C. Suru river valley.
The Purigpa are a tribe of Ladakh, India. They are found in the Suru river valley, which is located in the Leh district of Ladakh. The Purigpa are a Buddhist people and speak the Purigpa language. They are a traditional farming community and their main crops are barley, wheat, and peas. The Purigpa are also known for their woodcarving and metalwork.
The other options are incorrect. Leh is a city in Ladakh, India. Ladakh is a region in the Indian state of Jammu and Kashmir. The Suru river valley is a valley in the Leh district of Ladakh.