Which Is the BEST Conclusion to Be Drawn from the Literature

Which is the BEST conclusion to be drawn from the literature review on whether people are basically selfish or unselfish?

A) It cannot be concluded that people are basically altruistic because some high-quality studies have found that people help others out of genuine empathy.
B) The bulk of the research shows that people are basically altruistic and suggests that people rarely help others for selfish reasons, such as to avoid guilt or distress from not helping.
C) It cannot be concluded that people are basically altruistic because helping often depends on getting a reward, avoiding guilt, learning to be unselfish, and observing others help.
D) The bulk of the research shows that people are basically selfish and suggests that people always help others for selfish reasons.