In a study, the sample is chosen by Men with high blood pressure are assigned at random to four diets. In this experiment, the 240 subjects are labeled 001 to 240. Software assigns an SRS of 60 subjects to Diet 1, an SRS of 60 of the remaining 180 to Diet 2, and an SRS of 60 of the remaining 120 to Diet 3. The 60 who are left get Diet 4. This is a What is the sampling method? an observational study. an uncontrolled experiment. a matched pairs experiment. completely randomized design. B. block design, with four blocks. C. matched pairs design