A Year-Long Fitness Center Study Sought to Determine If There

Multiple Choice

A year-long fitness center study sought to determine if there is a relationship between the amount of muscle mass gained y (kilograms) and the weekly time spent working out under the guidance of a trainer x (minutes.) The resulting least-squares regression line for the study is y = 2.04 + 0.12x.
For each additional minute (weekly) spent working out, the average muscle mass changed by

A) 2.04 kg
B) 0.12 kg
C) 204 kg.
D) 12 kg.