Archaeologists recently excavated a large collection of prehistoric bone and ivory tools in the sediments of a river in Florida. One carved ivory tool was made of the tusk of a mastodon, a species that has been extinct in Florida for 13,000 years. It is likely, therefore, that the region was inhabited by people as early as 13,000 years ago, since it can be reasonably assumed that the tools were made from locally available materials, and since _________________.
Which of the following, if true, most logically completes the argument?

Question

Examsnet · Accepted Answer

Correct Answer is :  mastodons were the only possible sources of ivory in Florida 13,000 years ago

GMAT Verbal Reasoning Practice Test 7