The Main Conclusion of "Speciesism and the Idea of Equality

The main conclusion of "Speciesism and the Idea of Equality" is:

A) The principle of equality is not a good principle.
B) Humans' capacity for suffering is greater than nonhuman animals' capacity for suffering.
C) Nonhuman animals lack the capacity for suffering and, so, lack interests.
D) There are morally relevant differences between human and nonhuman animals that justify our giving greater weight to human interests.