Which Statement Best Describes the Use of Animals in Psychological

Which statement best describes the use of animals in psychological research

A)  While ethical principles govern the treatment of humans in research, there are no ethical principles for conducting animal research. 
B)  Animals are to be used in research if there is evidence that the results will benefit both humans and other animals. 
C)  Animals are used as subjects only for procedures that are too harmful for human participants. 
D)  Psychologists, if given a choice, always prefer to conduct animal research instead of human research.