The correct answer is option 'A', Jon.

Explanation:
The quote, "we aren't afraid of dying if we can all be together — you and Mummy, Sue and I," is spoken by Jon in the story "The End of the Party" by Graham Greene. Let's dive into the details of the story to understand the context of this quote.

Summary of the Story:
"The End of the Party" is a short story about a young boy named Francis, who is invited to a birthday party at his friend Jon's house. However, during the party, Francis overhears his older brother, Peter, talking to some crewmen. They mention that someone died in the house, and Peter suggests that it might have been Francis. This unsettling information fills Francis with fear, and he becomes obsessed with the idea that he might die that night.

The Context of the Quote:
As the night progresses, Francis becomes more anxious and seeks reassurance from Jon. Jon tries to comfort Francis and alleviate his fears by saying, "we aren't afraid of dying if we can all be together — you and Mummy, Sue and I."

Explanation of the Quote:
Jon's statement reflects the innocence and bond between the two friends. It suggests that Jon is willing to face death as long as they can all be together as a family. The quote highlights Jon's empathy towards Francis and his desire to provide comfort and support during a time of fear and uncertainty.

Jon's words also emphasize the theme of unity and the importance of family. He believes that as long as they are together, they can overcome any fear, including the fear of death. This sentiment showcases the strong bond between the characters and their reliance on each other for emotional support.

In conclusion, Jon's quote, "we aren't afraid of dying if we can all be together — you and Mummy, Sue and I," illustrates his compassionate and reassuring nature. It highlights the theme of unity and family bonds in the story "The End of the Party."