Final answer:
The study found that rats supplemented with blueberry powder showed the most notable improvement in their memory and motor skills.
Step-by-step explanation:
The subject of this question is Biology and it is suitable for High School level students.
The study was conducted to investigate the effects of different dietary supplements on memory and motor skills in rats. The rats were divided into groups and fed either a standard diet or a diet supplemented with blueberry, strawberry, or spinach powder. After eight weeks, the rats were tested for memory and motor skills.
The results showed that all supplemented rats showed improvement in their memory and motor skills. However, the rats supplemented with blueberry powder showed the most notable improvement. Therefore, the correct statement is option D) Blueberry supplementation showed the most notable improvement in memory and motor skills.