Select the correct option:
Although the experiment had been meticulously designed, unforeseen variables ___ the reliability of its conclusions.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. undermined.
Context: The sentence uses the conjunction "Although", which indicates a contrast between the careful design of the experiment and the negative impact of "unforeseen variables" on its results.
Analysis of the given options:
- Bolstered: To support or strengthen; this contradicts the negative sense of "unforeseen variables".
- Ratified: To formally sign or make an agreement official; this is used for treaties or laws, not scientific reliability.
- Undermined: To lessen the effectiveness, power, or ability of something, especially gradually or insidiously; this fits the context of reducing reliability.
- Exacerbated: To make a problem or bad situation worse; while negative, it is usually used for existing conditions rather than the validity of data.
Correct word: undermined.
Final sentence: Although the experiment had been meticulously designed, unforeseen variables undermined the reliability of its conclusions.
Hence, the chosen option is correct.