To Help Reduce the Effects of Hypertension (High Blood Pressure)

To help reduce the effects of hypertension (high blood pressure) , researchers were interested in the effects of an acute 30 min bout of exercise over a two-week period. Resting blood pressure was measured before and after the two weeks of exercise and statistical significance was determined to be p = .001. Which of the following descriptions best describes its meaning?

A) A difference was found between the pre and post measurements and there may be an important effect.
B) A difference was found between the pre and post measurements and there is an important effect.
C) A difference was not found between the pre and post measurements but there may be an important effect.
D) A difference was not found between the pre and post measurements and neither was there an important effect.