A study was done of a new medication that may help prevent heart attacks. The medication was tested on 20 U.S. males aged from 40 to 65. Listed are some changes that might have been made in the study. Which change would have made the study MOST meaningful?
A) including women in the study
B) including citizens of other countries in the study
C) increasing the number of participants in the study
D) testing the medication on people of a wider age range
