Passage Summary: A researcher thought small size helped birds live longer, but a critic points out that small birds are usually younger, suggesting age might be the real reason for their survival.

Reasoning: Smaller birds had higher survival rates than larger ones in a study, but a critic argues that size might not be the cause because smaller birds are typically younger.

Analysis: Since this is a 'Most Strongly Supported' question, we must treat the statements as facts and see what they imply when combined. The tension here lies in the 'confounding variable': age and size are correlated, which makes it difficult to determine which one actually causes survival. Look for an answer that reflects this relationship or suggests that the researcher's data could be explained by age just as easily as by size. We are essentially looking for a cautious synthesis of the two viewpoints provided.