The filament of spirogyra were put into equal volumes of sugar solutions X and Y. After 5 minutes, filaments from solution X had their cells contents rounded up while those from Y were unaffected. The experiment shows that

A. solution X was stronger than Y  
B. solution Y was stronger than X
C. Spirogyra used up the sugar in solution X
D. solution X is good for stimulating sexual reproduction in Spirogyra
E. solution Y was less contaminated than X

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Correct Answer: A