Answer: <u>Opportunity cost</u> is what you give up (the benefits of the next best alternative) when you make a choice.
Explanation:
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While the children swam in the pool, the parents sat and chatted.
At this the narrator becomes angry at the bird and suggests that it may be a visitor sent from the devil. This is what he means when he says, "Whether Tempter sent." He believes the bird to be a prophet, thing of evil, bird, or devil--some agent sent by Satan to cause him further torment.
Here is a link of the meanings of Adjectives_nouns and pronouns and even more you might want. ^_^
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