Critical Reasoning (CR) | Marine biologists had hypothesized that lobsters kept together

Marine biologists had hypothesized that lobsters kept together in lobster traps eat one another in response to hunger. Periodic checking of lobster traps, however, has revealed instances of lobsters sharing traps together for weeks. Eight lobsters even shared one trap together for two months without eating one another. The marine biologists’ hypothesis, therefore, is clearly wrong.

The argument against the marine biologists’ hypothesis is based on which one of the following assumptions?

(A)
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