A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet. A 95% confidence interval for 1 - 2 based on sample data is given by (-26.79, -2.41) where 1 is the population mean blood pressure level for the treatment group and 2 is the population mean blood pressure level for the control group. Based on this confidence interval, what, if any, conclusions can we draw for a confidence level of 95%?

• A.Since all of the values in the interval are negative, we can conclude that the population mean blood pressure level is lower for the treatment group than for the control group.
• B.Since all of the values in the interval are negative, we can conclude that the population mean blood pressure level is higher for the treatment group than for the control group.
• C.Since all of the values in the interval are negative, we are unable to conclude that the population mean blood pressure level differs for the two groups.
• D.We are unable to draw conclusions without knowing the associated p-value