What event led to Paramesvaravarman II's decision to attack the Gangas?

A. A trade agreement between the Pallavas and the Chalukyas
B. A royal marriage between the Pallavas and the Chalukyas
C. A strategic alliance between the Pallavas and the Gangas
D. The attack on the Pallava capital Kanchi by the Chalukyas and their Ganga allies
Answer: 