Final answer:
The mother's opinion on her son going to war suggests she does not favor the idea due to the family's anti-war beliefs, and she would find it challenging to accept it as it would mean risking losing her son.
Step-by-step explanation:
Based on the excerpts provided, the mother's opinion on her son Henry going to war would most closely align with option (a): She wants to obey her husband but she doesn't want to lose her son. The mother has brought up Henry with the beliefs of her late husband, who had serious misgivings about war after serving in the Civil War and losing his arm. Both parents agreed that Henry should be raised to view war critically. Therefore, it would be difficult for her to endorse the notion of war and accept her son's decision to enlist. It's clear that while she may understand her son's reasons, her opinion, shaped by past experiences and family beliefs, goes against the concept of participating in war, reflecting her desire to keep her son safe.