(单选题)How to understand the word “speciesism” in Paragraph 10?

A、 Dismissing animals’ experiences of pain or sufferings as morally irrelevant, without providing a principled reason for such differential treatment amounts to a form of “speciesism”.
B、 Like racism or sexism, speciesism is intended to evoke the idea that it is morally indefensible to treat members of an entire category differently solely because they are members of that category.
C、 The use of animals in medical research is morally indefensible if there is not enough substantive criteria.
D、 All of the above.