What Does the Increase in Studies on Empathy-Based Altruism Mean

What does the increase in studies on empathy-based altruism mean for understanding motives for helping others?

A) It demonstrates that there is indeed interest in learning how to be empathetic.
B) It indicates that researchers want to discard the idea of egotism-based altruism.
C) It means that laypeople have a clear interest in learning how to help others without external motives.
D) It shows that egotism-based altruism is not the only explanation for helping behaviors.