The inference is that the sentence that best integrates the quote into the text is D. Training animals to use email is not as far-fetched as it may sound." It's an idea originated by author Marlene Cousins.
It should be noted that an inference simply means the conclusion deduced based on the information.
Here "Training animals to use email is not as far-fetched as it may sound." It's an idea originated by author Marlene Cousins" bed uses the quote.
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