Japan's immediate response was to occupy Saigon, again with Vichy France's acquiescence. If Japan could gain control of Southeast Asia, including Malaya, it could also control the region's rubber and tin production—a serious blow to the West, which imported such materials from the East.
<span>The invention of tools and mastery of fire led to the development of "advanced civilizations," since this allowed for early humans to gain far more food sources and intake more calories. </span>
The answer is either A. or D.
