The Nurse in Charge of a Clinical Study Welcomes the Participants

The nurse in charge of a clinical study welcomes the participants in an open forum.There are members from diverse ethnic groups represented. Which of the following are the reasons why in the past ethnic variables were largely unknown or ignored for which reasons? Note: Credit will be given only if all correct choices and no incorrect choices are selected.
Standard Text: Select all that apply.

A) Clinical trials failed to include ethnically diverse subjects.
B) Little attention was focused on identifying the effects drugs had on various ethnic groups.
C) Research proved there were no differences among ethnic groups.
D) The large majority of clinical trials included Caucasian females.
E) Clinical trials comprised mostly Caucasian males.