Which of the Following Was a Conclusion Based on Experiments

Multiple Choice

Which of the following was a conclusion based on experiments with "maze-bright" and "maze-dull" rats?

A) An enriched environment increases maze-running ability only in dull rats.
B) A poor environment adversely affects maze-running ability in both bright and dull rats.
C) Maze-running ability is highly heritable and unaffected by environment.
D) Maze-running ability is based entirely on environment and unaffected by genes.