Answer:
Without knowing which play you are referring to, I cannot provide a specific answer. However, in general, the friendship between two characters in a play can contribute to the development of a theme in various ways. For example, their interactions and conversations can reveal important aspects of the characters' personalities, values, and beliefs, which can be relevant to the play's central theme. The conflicts or challenges they face together can also highlight the theme of the play, as well as demonstrate the importance of friendship and support in dealing with difficult situations. Additionally, the way in which their friendship evolves throughout the play can reflect changes in the characters' attitudes and feelings, and can ultimately contribute to a deeper understanding of the play's overall message or theme.