ExplanationStudents who are more attuned philosophical debate would find math and science to be difficult or demanding. Both facile and elementary are nearly the opposite of what you’re looking for, so eliminate choices (A) and (D).
Neither stupefying, which means perplexing, nor meticulous, which means attentive to detail, is supported by the sentence, so eliminate
choices (B) and (C). Both exacting and onerous can mean demanding, so choices (E) and (F) give you appropriate, equivalent sentences.
Hence options E and F are correct!
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