Clear D
A - Illogical
B - Not clear what "they" refers to
C - Not clear what "them" refers to and devices bring out difficulty is illogical statement
D -CORRECT
E - LogicalError
Hence, Answer is D
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A - Illogical
B - Not clear what "they" refers to
C - Not clear what "them" refers to and devices bring out difficulty is illogical statement
D -CORRECT
E - LogicalError
Hence, Answer is D
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...





