GMAT Critical Reasoning (CR) | Re: Half of the subjects in an experiment the experimental group

Dearmoulayabdesslam ,
This is a great question! I'm happy to help.

For this and related question, it's good to have the general ideas of experimental design. See:
Medical Trials and the Placebo Effect on the GMAT Critical Reasoning

A.Most consumers of the sweetener do not consume as much of it as the experimental group members did.
The conclusion concerned the comparison of control group to experimental group. What