I believe the answer is: B. to avoid capture by the Japanese in the Philippines
Ausralia was a part of the British common wealth and England was one of our strongest ally during the world war II. By escaping to Australia, General Macarthur managed to gained protection from the Japanese army who seek to maim American millitary by eliminating Macarthur.
B. He had to leave for australia because he was losing. The president thought he was doing a poor job leading but couldn't completely get rid of him because he was adored by the public.
