A linear regression model for the relationship between SBP in mmHg and BMI controlling for age in years found the following results 12=0.60 Variable Coefficient p value Intercept -44.0 .01 BMI 4.0 0005 Age 1.5 001 O A. If all the predictor variables are 0 the x-intercept is -44.0 B. The effect of age is not significant O C. When other variables are held constant a two-unit increase in BMI is associated with an 8-unit increase in SBP O D. Sixty percent of the variance in SBP is explained by BMI