Could you give the synonym of "opportunity" here?

[Lolita]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #293 "Economics Questions test (1)", question 8

Whether it's a natural resource or not, every possible use of a resource is called an ..........

(a) opportunity
(b) shortage
(c) costs

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #293 "Economics Questions test (1)", answer 8

Whether it's a natural resource or not, every possible use of a resource is called an opportunity.

Correct answer: (a) opportunity

Your answer was: correct
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Could you give the synonym of "opportunity" here?

Lolita

[Mister Micawber]

.
This seems to be a rather specialized use of the word, Lolita. 'Possible use' seems closer than any other word that occurs to me. 'Potential' is close, but is uncountable.
.
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Native English teacher at Mister Micawber's

[Licinio]

It would be better to provide the clues with the article, otherwise the answer is prompted by choosing the clue that matches "an" in the sentence. As a matter of fact in this case there is only one possible answer starting with a consonant!

[Mister Micawber]

Yes, of course, Licinio. Thanks for pointing that error out. I have fixed it, and the revision will appear with our next database update.
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Native English teacher at Mister Micawber's