Explanation:

About Arunachal Himalayas

• The Himalayan range enters Arunachal Pradesh from Bhutan at the West Kameng district. The region is a series of high ridges and low valleys and the altitude in the region varies from 800 m to7,000 m above sea level.
• Dafla Hills, Miri Hills, Abhor Hills, Mishmi Hills and among others are found in the Arunachal Himalayas region.
• These mountains are dissected by numerous rivers like the Kameng, Subhanshri, Dihang, Lohit etc.
• Himalayan ranges take sharp southward bends known as Syntaxial bend at two locations namely, the Western Syntaxial bend and Eastern Syntaxial bend.  The Western Syntaxial bend is located near the Nanga Parbat in the vicinity of the Indus River. While the Eastern Syntaxial bend is located near Namcha Barwa in the Arunachal Himalayas in the vicinity of Dihang River.

Hence all statements are correct.