A) X: air, water; Y: butter paper, tissue paper; Z; cardboard, wood
B) X: muddy water, ground-glass; Y: air and metals; Z: brick and stone
C) X: alcohol, groundnut oil; Y: ground-glass, butter paper; Z: air, brick
D) X: plastic, air; Y: muddy water, water; Z: book, brick
E) None of these
Correct Answer: A
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