PT 37 Sec.2(LR) Q.26

[sg7007]

This is the lagoon/frogs/owl problem.

The correct answer is (D). Why not (E)?

Here's how I thought. The passage's reasoning states that,
Ashley Collects -> Tanzanite stones -> Found in Tanzania
Therefore, Ashley is unlikely to gather stones not from Tanzania.

I thought (E) had the same reasoning.
Owl Eats -> Frogs -> In lagoon
Therefore, Owls are unlikely to eat something living outside the lagoon.

What is wrong in my reasoning?

Thanks in advance.

[nooyyllib]

You forgot the "all known deposits". 

when i approach parallel questions i try to look at the stimulus as a "whole".  I try to match the (1) logic, (2) structure, (3) flaw if necessary. 

All known deposits are in tanzania.  so ashley collects only tanzanite stones, and unlikely will collect stones not from tanzania. 

(D) the only frogs yet discovered are in the lagoon.  since owls only eat frogs from the lagoon, they will never eat an animal outside of the lagoon. 

if you look at the choice, all structural aspect matches.

(E) is wrong because of structural reasons.

[sg7007]

So.. How do you diagram "Each frog on Scrag Island lives in the lagoon"?
Is this the same statement as "All frog on Scrag Island live in the lagoon"? (Frog on Scrag Island -> Live in the Lagoon)

Also, is the reasoning in the choice (E) false?

You forgot the "all known deposits". 

when i approach parallel questions i try to look at the stimulus as a "whole".  I try to match the (1) logic, (2) structure, (3) flaw if necessary. 

All known deposits are in tanzania.  so ashley collects only tanzanite stones, and unlikely will collect stones not from tanzania. 

(D) the only frogs yet discovered are in the lagoon.  since owls only eat frogs from the lagoon, they will never eat an animal outside of the lagoon. 

if you look at the choice, all structural aspect matches.

(E) is wrong because of structural reasons.