Final answer:
Monica is planning to give the item to Christine after having it changed and cleaned, based on the dialogue provided.
Step-by-step explanation:
Based on the dialogue, “So I'll have it changed and cleaned, then it's yours,” it appears that Monica is going to give the item to someone after having it changed and cleaned. Therefore, the correct answer to the question “What is Monica going to do with the item she mentions in the dialogue?” is (c) Give it to Christine.