A nutritionist has received funding to test three well-known diet programs. The nutritionist has grouped his patients into two groups: those who are more than 100 lbs overweight (63 patients) and those who are less than 100 lbs overweight (39 patients). He randomly assigns the 63 patients to diet program A, B, or C and follows them for 1 year. He also randomly assigns the 39 patients to diet programs A, B, or C and follows those patients for 1 year. At the end of the year, the change in weight is calculated for each patient. What is the explanatory variable?单项选择题

A

The diet program (A,B,C)

B

The change in weight

C

The nutritionist

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