In a diabetes study we compared fathers' blood sugar levels and their sons' blood sugar levels. We took a sample of 200 fathers and for each father we measured his blood sugar level and his son's blood sugar level. We obtain correlation coefficient R =.84. That means

A. Diabetes is genetically inherited

B. the lower the father's blood sugar level the lower the son's blood sugar level

C. father's blood sugar level is not significantly different from his son's blood sugar level

D. if a father has a low blood sugar level then his son will have a low blood sugar level