Answer :
Based on the fact that Group A received treatment, they are the experimental group.
What is the experimental group?
- This group is tested for the variable in a research.
- In medicinal research, they receive the medicine being tested.
As Group A were the ones to receive the treatment for severe depression, we can conclude that they were the experimental group.
Find out more on experimental groups at https://brainly.com/question/22675982.