Answer:
About 642 miles (1,034 kilometers).
Explanation:
Due to rapid urbanization fueled by trade, approximately 87 percent of people live in urban areas of Australia. The correct option among all the options that are given in the question is the first option or option "A". A large part of Australia is covered in jungle and so major cities are places where people flock the most.
Wikipedia says that the largest major plate is the Pacific, and that the smallest minor plate is Juan de Fuca. So that must be the correct answer after all.