Answer:
As an empire, Rome invested resources and rebuilt the cities of Roman Greece, and established Corinth as the capital city of the province of Achaea, whilst Athens prospered as a cultural hub of philosophy, education, and learned knowledge.
The correct answer is an experimental study with one independent variable.
This study is an experimental study because it involves investigating a causal relationship between two phenomena. In this study the researcher is investigating the relationship and checking for causality between the size of a group, and its effect on conformity behavior. This study furthermore has an independent variable (i.e. a variable that is manipulated and controlled) which is the size of the group of people staring up at a window.
Mercantilism is the correct answer <span />