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.