Scientists hypothesize that Tyrannosaurus Rex was a predator

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Scientists hypothesize that Tyrannosaurus Rex was a predator so overwhelmingly powerful that it had yet to be encountered by its superior at the time of its extinction.

A. that it had yet to be encountered by its superior at the time of its extinction

B. that at the time of its extinction it had yet to encounter its superior

C. at the time of its extinction there was yet its superior to be encountered

D. that its superior was yet to be encountered at the time of its extinction

E. encountering its superior was yet to happen at the time of its extinction

OA B

Source: Princeton Review