Which phrase best captures the idea of disappointment from the statement "I was unhappy with the results"?

The phrase "I was let down by the results" accurately conveys the sentiment of disappointment expressed in the statement "I was unhappy with the results." The use of "let down" directly aligns with feelings of dissatisfaction or disillusionment that typically accompany disappointment. It suggests a sense of expectation that was not met, which is fundamental to the feeling of being unhappy with an outcome.

The other choices do not reflect disappointment. "I was pleased with the results" clearly conveys satisfaction, while "I was unaffected by the results" indicates neutrality, and "I was surprised by the results" implies a lack of emotional response related to disappointment. Therefore, the correct phrase captures the essence of the original statement's negativity regarding the results.