Which One of the Following Statements Is True Concerning the Nonequivalent

Which one of the following statements is true concerning the nonequivalent control group design?

A) It has an experimental and control group but lacks random assignment of subjects to groups.
B) It uses two nonequivalent control groups with random assignment of subjects to groups.
C) It is used to make comparisons between two non equivalent groups that are randomly assigned to experimental and control conditions.
D) It uses two groups that are initially the same but are found to be nonequivalent at the end of the study.