Question

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

• A. undermined
• B. bolstered
• C. ratified
• D. exacerbated

Answer 1

Answer:

A. undermined

• 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.