I think you should review your message, make sure there aren't a lot or any mistakes and stuff like that.
Explanation: ok will do no worries
According to edgen. it is A
Answer:
yes
Explanation:
The study is an experiment that was conducted between the 1932 and 1972 by the UNPS that is united nations public health services. It was taken up by the center of disease control and prevention. The main aim was to study and observe the diseases when untreated. The initial experiments were made of 6 months.
