Answer:
B. In a speech, the theme is also used as an organizational tool.
Step-by-step explanation:
A theme in a speech can serve the purpose of unifying the various points that is available in the speech.
A theme in a written work is the subject that is being talked about in the written work which could be prose, poetry, etc.
However, the major difference between a them in a speech and a written work is that the theme of a written work while unifying the various ideas serves as an organizational tool.