A study was done to investigate the relationship between bodybuilders' weights and daily protein intake. The correlating linear model is shown below, where x represents the bodybuilder's weight [in pounds], and y represents their daily protein intake [in grams]. Interpret the slope.



A.

An additional 1.5 grams of protein intake is associated with an additional pound of bodyweight.

B.

An additional 1.5 grams of bodyweight is associated with an additional pound of protein intake.

C.

An additional 1.5 pounds of protein is associated with an additional gram of bodyweight.

D.

An additional 1.5 pounds of bodyweight is associated with an additional gram of protein intake.