Final answer:
The correct statement is B) The middle 50 percent of the members lost from two to 8.5 lbs.
Step-by-step explanation:
The correct statement is B) The middle 50 percent of the members lost from two to 8.5 lbs. This option provides a specific range of weight loss, indicating that half of the members lost between two and 8.5 pounds. It is the only statement that gives a clear and precise range, making it the correct answer.
The other statements either provide incomplete or general information that cannot be determined from the given options. Therefore, option B is the correct choice.