Final answer:
Group A is the experimental group as it receives the actual drug being tested, whereas Group B is the control group that receives a placebo.
Step-by-step explanation:
The experimental group in Susie's study is Group A, which is administered the drug in pill form. This is because the experimental group is the one receiving the actual treatment being tested, whereas Group B serves as the control group and is given a pill that contains only inert ingredients.
The purpose of the control group is to serve as a baseline to compare against the experimental group's results.