Final answer:
During the last ice age, early humans migrated to Australia by watercraft, as there was no land bridge between Southeast Asia and Australia.
Step-by-step explanation:
The map supports the statement that early humans could migrate to Australia only by boat or other watercraft (Option B). During the last ice age, sea levels were lower and land bridges connected various regions, such as the Bering Land Bridge allowing migration to the Americas. However, it is important to note that there was never a land bridge between Southeast Asia and Australia, requiring humans to use some form of watercraft to reach Australia. Archaeological evidence shows that ancient humans accomplished transoceanic voyages to the Pacific Islands, indicating that they had the necessary technology and skills to travel by sea.
The map substantiates the assertion that early humans could migrate to Australia exclusively by boat or other watercraft (Option B). While land bridges, like the Bering Land Bridge, facilitated migrations during the last ice age, no such connection existed between Southeast Asia and Australia. Therefore, the map underscores that human migration to Australia required seafaring capabilities due to the absence of a direct land route.
Archaeological evidence supports this conclusion, revealing that ancient humans had the technological prowess and navigational skills to embark on transoceanic voyages. These findings include migrations to the Pacific Islands, emphasizing that early humans possessed the means to navigate open waters. Thus, the necessity of watercraft for reaching Australia is reinforced, shedding light on the remarkable maritime abilities of early human populations during prehistoric times.