What is a key criticism of Kohlberg's morality theory?

Researchers using naturalistic observations to study an animal colony must avoid making friends with the animals to minimize the

a. placebo effect. b. problem of sampling bias. c. effect of the independent variable on the dependent variable. d. effects of the observer on the observed.

Medical treatments involving one medication are more likely to be adhered to by a patient than treatments involving several medications

Indicate whether this statement is true or false.