In a study of two groups, the following results were obtained: Group AGroup BSample size2025Sample mean2223Sample standard deviation1012 Which of the following statements is correct?

• A. Group A is less variable than Group B because Group A's standard deviation is smaller.
• B. Group A is less variable than Group B because Group A's sample size is smaller.
• C. Group A is less variable than Group B because Group A's sample mean is smaller.
• D. Group A is less variable than Group B because Group A's coefficient of variation is smaller.