The dictionary definition that best reflects the word "interpose" as it is used in the passage is "to put in a remark or question in the midst of a discourse."
All of the options presented as answer choices are possible meanings of "interpose," but we must take the context into consideration. As we can see, the passage is a dialogue and, as one person is talking, the other one "interposes."
That means the second person put in a remark in the midst of their discourse, that is, the conversation was interrupted when he said something.
With the information above in mind, we can choose definition 3 as the correct answer.
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