Meaning of 'no problem'

[Guest]

Test No. incompl/elem-33 "Responses (6)", question 1

John: 'Thank you so much.'
Sue: '.........'

(a) No problem.
(b) Any problem.
(c) A problem.
(d) Some problem.

Test No. incompl/elem-33 "Responses (6)", answer 1

John: 'Thank you so much.'
Sue: 'No problem.'

Correct answer: (a) No problem.
_________________________

how much is it?

[Alan]

This means it's all right.
_________________
English as a Second Language
You can read my ESL story Present Simple

[Jaeatnguyen]

Hi, Alan.
You say "This means it's all right". Is it true for a suitable sense of this situation? When we reply to an grateful sentence if we consider about the degree as all right or partial. This's my doubt.
Please give me an explanation.
Thank you so much.

Jaeat

[Alan]

Hi,

It is a simple response to someone expressing thanks/gratitude.

Alan
_________________
English as a Foreign Language
You can read my EFL story Progressive Forms