PrepTest 37, Section 2, Question 26

Difficulty:

All known deposits of the mineral tanzanite are in Tanzania. Therefore, because Ashley collects only tanzanite stones, she is unlikely ever to collect a stone not originally from Tanzania.

Question

Which one of the following is most similar in its reasoning to the argument above?

The lagoon on Scrag Island is home to many frogs. Since the owls on Scrag Island eat nothing but frogs from the island, the owls will probably never eat many frogs that live outside the lagoon.

Every frog ever seen on Scrag Island lives in the lagoon. The frogs on the island are eaten only by the owls on the island, and hence the owls may never eat an animal that lives outside the lagoon.

Frogs are the only animals known to live in the lagoon on Scrag Island. The diet of the owls on Scrag Island consists of nothing but frogs from the island. Therefore, the owls are unlikely ever to eat an animal that lives outside the lagoon.

The only frogs yet discovered on Scrag Island live in the lagoon. The diet of all the owls on Scrag Island consists entirely of frogs on the island, so the owls will probably never eat an animal that lives outside the lagoon.

Each frog on Scrag Island lives in the lagoon. No owl on Scrag Island is known to eat anything but frogs on the island. It follows that no owl on Scrag Island will eat anything that lives outside the lagoon.

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