2. The main reasons why Muralidharan and Sundaraman (Aggregate Effect of School Choice) conduct a 2-stage experiment (randomization among villages followed by randomization at the student level) are to a. Ensure that the RCT involve as many students as possible b. Get the largest possible treatment group, in terms of number of students, and increase the statistical power c. Avoid the problem of a contaminated control group and to estimate spillover effects d. Serve as a template for national-level implementation