题目内容：
What did the author intend to illustrate by citing a comparison from an NRF survey on the expenses of a typical self-gifter and those of a typical shopper?
A．Self-gifters were only interested in self-pleasure. B．Self-gifting could be a sign of abstemiousness.
C．Self-gifting was very conducive to living frugally.
D．Self-gifters bought things both for themselves and for others.
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答案解析：