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Answer» SOLUTION

"Many of these operators utilize an assortment of methods, but among them Morse code GETS through when other methods fail."
This sentence suggests that among VARIOUS method, Morse code gets through whereas others fail.
=> Assortment MUST mean 'various'.
=> Options A, B and C can be eliminated.
"Group of methods" appears to be a restricted list wheras "variety of methods" appears to be many methods.
Hence, 'variety' is a better fit for the blank.
=> Option D is the answer.



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