Which of the Following Situations Would Be Offered as a Justification

Which of the following situations would be offered as a justification for the use of animals in research?

A) Because communication is limited, animals are not subject to researcher biases.
B) Sometimes the course of even well-documented diseases needs to be observed.
C) Psychology students need practice dissecting the brain and implanting electrodes.
D) In order to test the effects of brain damage on particular skills, animals offer a means of controlling the types of damage