Not necessary

[titikhun samanachan]

Test No. incompl/elem-33 "Responses (6)", question 8

John: 'We'd like to give you this small present to show our gratitude.'
Sue: '.........'

(a) It's really not needed.
(b) It's really not wanted.
(c) It's really not demanded.
(d) It's really not necessary.

Test No. incompl/elem-33 "Responses (6)", answer 8

John: 'We'd like to give you this small present to show our gratitude.'
Sue: 'It's really not necessary.'

Correct answer: (d) It's really not necessary.
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please explain the reason why must be not necessary,and the others are incorrect

[Alan]

Here this means you didn't have to and is a polite way of saying I didn't expect it and you should not have given it to me. Not needed/wanted/demanded would all be impolite because they mean that something is not required.
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