What was the response when asked who was at the door?

The appropriate response when asked who was at the door is a worthy brother wishing to advance. This phrase emphasizes the importance of progression within the Masonic system, where members are encouraged to seek knowledge and enlightenment. This reflects the journey of a Fellow Craft, as they are often at a stage in their Masonic education where they seek to advance to the next level of initiation or understanding.

In Masonic tradition, the act of identifying oneself at the door is symbolic and carries deep meaning. It signifies not just a physical entry but also a spiritual and intellectual aspiration within the Lodge. Thus, the phrase "a worthy brother wishing to advance" encapsulates this sentiment perfectly, as it implies a readiness to grow and learn from the Lodge's teachings.

The other choices may refer to individuals that are related to Masonic practices, but they do not specifically highlight the intention behind seeking entry into the Lodge as clearly as the correct response does.