C. Include their source in their bylines
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The right answer is the letter D.
This is because opportunity cost is a term used in economics to indicate the cost of something in terms of a given opportunity, that is, the cost, even social, caused by the renunciation of the economic entity, as well as the benefits that could be obtained from this resigned opportunity or, even, the highest income generated in some alternative application.
In the case of the matter, there was a waiver on the opportunity to pay for a family trip, so that the family could buy a computer.
Th answer is A !!!!!!!!!!!!!!!!!!
