What new events have further complicated the conflict in Kashmir

I know the options cause i want to question answer as well.

a. An incursion by China into the northern territory of Kashmir has added a new player in the conflict.

b. On going tribal violence in the region has proven beyond the control of the Pakistani and Indian governments.

c. New research regarding the sequence of events that led to Hari Singh signing the Instrument of Accession has raised new doubts about the legitimacy of India's claims to the territory.

d. None of the above.