The statement that is true of the 2004 Indian Ocean tsunami is:
The tsunami displaced upwards of 1.7 million people.
The other statements are not accurate. The tsunami affected multiple countries, with significant deaths and damage occurring in several nations, including Thailand, Sri Lanka, India, and others, not just Indonesia. The international community did mobilize a large response to the disaster, although there were critiques about the speed and coordination of aid. The tsunami did not significantly halt global trade.