In the Nineteenth Century, the Governments of China and Japan

In the nineteenth century, the governments of China and Japan:

A) reversed their ages-long free trade policies and isolated their economies despite pressure from other countries to continue trading.
B) decided on their own to reverse their isolationist policies and open their economies to trade.
C) gave in to pressure from a number of other large countries and opened their economies to trade.
D) both decided to remain isolated from the rest of the world despite the globalization that was sweeping the world economy.