What percentage of trials did sunflower sea stars select nutritionally rich urchins?

• A. 42.7% of trials
• B. 37.5% of trials
• C. 50% of trials
• D. 25% of trials

Answer: (A)

Understanding how to read results from a behavioral study involves focusing on how often a subject makes a given choice across trials. When a result reports a percentage, it’s giving the exact frequency of that choice in the trials. Here, the sunflower sea stars chose nutritionally rich urchins in the percentage shown by the data, which is the precise proportion observed. That makes it the best answer because it directly matches what the study found. The other options describe different frequencies and don’t align with the observed result. In this light, you can also infer the preference is real but not overwhelming, since the observed proportion is not at 完 full or random levels.