Pretty obvious

[Guest]

Test No. incompl/advan-28 "Mistaken Identity", question 5

Interviewer: I should have thought this was ..........

(a) clear ovious
(b) mostly obvious
(c) pretty obvious
(d) mainly obvious

Test No. incompl/advan-28 "Mistaken Identity", answer 5

Interviewer: I should have thoug this was pretty obvious.

Correct answer: (c) pretty obvious

Your answer was: incorrect
Interviewer: I should have thoug this was clear ovious.
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Is "pretty" here not too informal as it concerns an interview? Wouldn't be "quite" better as "clear" is absolutely wrong?

[Alan]

No, this is acceptable here and indicates the irritation of the interviewer.
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English as a Second Language
You can read my ESL story In short