Final answer:
The ending of a play often includes falling action and resolution, which can indicate which conclusion is best supported. If the conclusion is about a mistake with homophones, it might relate to a pivotal misunderstanding resolved in the play's ending.
Step-by-step explanation:
The conclusion that is best supported by the ending of a play can often be determined by the play's falling action and resolution. Without specific details of the play's ending, it's challenging to accurately pinpoint which conclusion is supported. However, based on the options provided, it seems that a typical falling action might include resolution between characters, revelation of truths, or a decline in the tension built up during the climax. Concluding that the person who wrote the graffiti has mixed up the spelling of two homophones could reflect a resolution in the play that centers around a misunderstanding or a pivotal moment that turns on the correct interpretation of words or messages.