Which of the Following Is True About the Current State

Which of the following is true about the current state of study of individual subjects?

A) The existence of therapeutic professions is being challenged due to the increasing awareness of the inadequacies of the uncontrolled case study.
B) Scientific studies of individual subjects have become empirical and more methodologically sophisticated than during the early 20th century.
C) Uncontrolled case studies are increasingly being preferred to single-subject experimental designs as they relate more closely to real-life situations.
D) The recent invention of descriptive and inferential statistics is encouraging group comparisons.