The best subject for a reflective essay would be "when my big brother left to become a soldier".
In a reflective essay, one can offer his ideas on a text, recount an experience or incident that occurred in his own life, or both.
A reflective essay accounts one's personal thoughts, emotions, and beliefs about the incident and how it impacted the person is explored during the experience. When someone's big brother leaves to become a soldier, one may feel a lot of emotions. This event can lead to provide the person experience different things as he may get alone and many responsibilities now fall upon his shoulder as the big brother has gone away. It can change a person's life.
Hence, the correct option is A.
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