Mention Australia and people think of sunshine, beaches and coral reefs. Mention the interior of Australia and people only think of the arid outback and desert. But Australia also has extensive rain forests, mountain ranges (a few with snow) and wetlands. It has rivers too, the mightiest of which is the Murray. It stretches over 2,500 km from its source high in the interior mountains to its mouth. Much of its length forms the boundary between the Australian states Victoria and New South Wales and it was once a busy waterway used to carry wheat, wool and timber from the interior to the city of Melbourne. Nowadays the river is quiet, not because the farming and lumbering has stopped but because the produce is carried by train and truck instead.

Question: You can still navigate the river Murray in a boat but the work of trans- porting produce has been lost to trains and trucks.
Options:
A. true, B. false, C. uncertain
Answer: "C"