In a study of the effects of diet on blood pressure, one group of 85 people followed a vegetarian diet for 4

months, after which time their mean systolic blood pressure was 15mm Hg lower than at the start. Another group of 75 people followed a non-vegetarian diet for the same length of time, after which their mean systolic blood pressure was 1 mm Hg lower. if a vegetarian diet had no effect on blood pressure, there would be less than 1 chance in a 100 of getting these results. Which statement is valid based on these results?

A. The recommended diet for lower blood pressure is vegetarian.

B. The result is not statistically significant.

C. The result is not practically significant.

D. The difference in the sample size of the two groups makes a conclusion impossible.

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