A pharmaceutical firm wants to test the effectiveness of a new weight-loss drug. The test is a controlled experiment in which a randomly selected group of subject is divided into two equal groups, only one of which receives the new drug. The other group receives a placebo. Identify all of the true statements among the following.

A.) The experiment will be considered deficient if the recipients of the true drug are sure that they have received the drug.

B.) The effectiveness of the drug will be measured by comparing the weight losses of the two groups.

C.) The study participants who do not receive the drug would not be expected to lose weight.

D.) The drug's effectiveness will be measured simply by the loss of weight among those who receive the drug.