The everyday behavior of whales is particularly difficult to study because introducing novel stimuli, such as divers or submarines, into the whales' environment causes whales to behave in unusual ways. Some biologists plan to train sea lions to carry video cameras on their backs and, on command, to swim along with whales. the whales would allow biologists to study the everyday behavior of the whales.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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