What does "requirement" mean?

[Lesserman]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #293 "Economics Questions test (1)", question 2

When someone really likes a product but that item is not necessary to stay alive, the product is called a ......... or a luxury.

(a) want
(b) need
(c) requirement

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #293 "Economics Questions test (1)", answer 2

When someone really likes a product but that item is not necessary to stay alive, the product is called a want or a luxury.

Correct answer: (a) want
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What does "requirement" mean?

Lesserman

[Mister Micawber]

.
No, 'want'. The item is not required (= not necessary).
.
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Native English teacher at Mister Micawber's