In a(n) _______________ study, a researcher carefully and systematically watches and records behavior, taking care to avoid affecting the subjects being studied

By what age has the subjective self fully developed?

a. 36 months b. 12-18 months c. 8-12 months d. 18-24 months

The frustration-aggression hypothesis is a good example of a middle-range theory

Indicate whether this statement is true or false.