Final answer:
Utilitarianism and Contractarianism, in principle, could allow for some medical experimentation on animals if the experimentation leads to the greater benefit for most entities or if societal rules deem it acceptable.
Step-by-step explanation:
The question concerns which views of animal rights would potentially allow for some medical experimentation using animals. Based on the descriptions of different ethical theories, we can determine that both (A) Utilitarianism and (B) Contractarianism could, in principle, permit medical experimentation on animals. Utilitarian views would allow such experimentation if it resulted in the greater benefit or happiness for the most entities, which could include a consideration of the potential human benefits derived from the experimentation. Similarly, Contractarianism might permit experimentation if the society's contractual agreements or rules consider it to be acceptable or beneficial for humans. However, (C) Biocentrism, which gives inherent value to all living things, would likely be less permissive of animal experimentation.