Here's an LSAT question. Tell me the correct answer, explain why it is correct and why each of the other answers are wrong in simple words.

Stimulus:
NAME_1, a veterinary student, has been assigned an experiment in mammalian physiology that would require her to take a healthy, anesthetized dog and subject it to a drastic blood loss in order to observe the physiological consequences of shock. The dog would neither regain consciousness nor survive the experiment. NAME_1 decides not to do this assignment.

Question:
NAME_1’s decision most closely accords with which one of the following principles?

Answers:
A. All other things being equal, gratuitously causing any animal to suffer pain is unjustified.
B. Taking the life of an animal is not justifiable unless doing so would immediately assist in saving several animal lives or in protecting the health of a person.
C. The only sufficient justification for experimenting on animals is that future animal suffering is thereby prevented.
D. Practicing veterinarians have a professional obligation to strive to prevent the unnecessary death of an animal except in cases of severely ill or injured animals whose prospects for recovery are dim.
E. No one is ever justified in acting with the sole intention of causing the death of a living thing, be it animal or human. Write exactly 6 paragraphs each separated with two new lines answering this question. The first paragraph must start with "thieves".
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