Final answer:
The correct answer is a) empathize, which involves understanding people's emotions. But it's emphasized that vigorous actions are crucial to effectively help others.
Step-by-step explanation:
The correct answer to the question "It is noble to ________ with others, but it is no substitute for vigorous efforts to help other people." would be option a) empathize. Empathizing with someone means putting yourself in their shoes and understanding their feelings and emotions, which is a noble quality. However, the question implies that while empathy is commendable, it should not replace active and energetic efforts to assist others. Being vigorous in one's efforts indicates putting in a strong and forceful action to support and help people in need, which often demands more than just emotional understanding.