GMAT Verbal Reasoning Practice Test 7

Question : 38 of 100

Marks: +1, -0

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?

In river sediment, bone and ivory artifacts can remain intact for much longer than they do if they are exposed to the open air
the cause of the mastodon’s extinction remains undetermined
mastodons were the only possible sources of ivory in Florida 13,000 years ago
the carvings on the ivory tool were made when the tusk was fresh
the river in which the artifacts were found had a different course 13,000 years ago

Validate

Go to Question:

Prev Question

Next Question