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Select the correct option: Although the experiment had been meticulously designed, unforeseen variables the reliability of its conclusions.

Aundermined

Bbolstered

Cratified

Dexacerbated

Answer:

A. undermined

Read Explanation:

• undermined

The word "Although" signals a contrast.

Even though the experiment was designed perfectly, unforeseen variables would naturally weaken or hurt the results.

Undermined means to weaken or ruin something systematically.


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