In a Set of Clinical Trials, a Pharmaceutical Company Wishes

In a set of clinical trials, a pharmaceutical company wishes to assess the effectiveness of its newly developed drug for depression by comparing its performance to the leading drug currently on the market and to a placebo control.What research technique or techniques would be possible and appropriate?

A) random assignment but not random selection
B) random selection but not random assignment
C) both random selection and random assignment
D) neither random selection nor random assignment