Suppose a Single Random Sample of Workers in a Factory

Multiple Choice

Suppose a single random sample of workers in a factory is exposed to five different reward systems in succession, with each system being used for one month. What is the name of the threat that reminds researchers that the research results for the last reward system may not generalize to the population of workers?

A) reactive effect of experimental setting
B) reactive effect of testing
C) Multiple-treatment interference
D) selection bias