How does the section “Egoic Altruism” (Paragraphs 3-5) contribute to the development of ideas in the text?

A
They provide readers with a scientific perspective of altruism as overly selfish, but the author presents this perspective as an attempt to excuse altruism.
B
They prove that the author’s opinion about altruism isn’t supported by the scientific community and is therefore not valid.
C
They support the notion that humans are capable of “pure” altruism; however, the author stresses that it’s uncommon due to humanity’s selfish nature.
D
They prove that “pure” altruism doesn’t exist as all forms of altruistic behavior are rooted in selfishness