Difference between requirement and necessity

[Oana]

Test No. incompl/advan-86 "GMAT Verbal Quiz (9)", question 2

As the police saw the accident themselves, the driver avoided the ......... of having to give a detailed report.

(a) need
(b) requirement
(c) indictment
(d) necessity

Test No. incompl/advan-86 "GMAT Verbal Quiz (9)", answer 2

As the police saw the accident themselves, the driver avoided the necessity of having to give a detailed report.

Correct answer: (d) necessity

Your answer was: incorrect
As the police saw the accident themselves, the driver avoided the requirement of having to give a detailed report.
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why 'necessity' and not 'requirement'

[Alan]

Here in this sentence we are talking about the official way in which an accident has to be reported. In other words a necessity is something you have to do and requirement doesn't have the same force or strength of meaning.
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English as a Second Language
You can read my ESL story Passive Voice