In the Text,the Authors Distinguish Between Effectiveness Studies (Which Are

Multiple Choice

In the text,the authors distinguish between effectiveness studies (which are designed to find out whether a therapy works in real,day-to-day clinical practice) and efficacy studies.How are effectiveness studies different from efficacy studies?

A) Effectiveness studies involve unhappy couples.
B) Efficacy studies involve experiments using a control group.
C) Effectiveness studies tell us whether a therapy works in a controlled laboratory setting.
D) Effectiveness studies and efficacy studies do not differ in any important way.