"at" or "from"

[Tespineli]

Hi! My daughter just had her quarterly test in English. There's one question that I am not quite sure how to answer and it goes like this:

Which of the following prepositions completes the sentence correctly?

The cook buys vegetables ___________ the market.

a. in b. at c. from

Can you tell me the correct answer, please? I'm confused between "at" and "from". Thanks!

[Gray]

The cook buys vegetables from the market.
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First lesson - English, not english. I, not i. ~A student of English

[Mister Micawber]

.
All 3 answers are fine. The original question is poorly written.
.
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Native English teacher at Mister Micawber's

[Tespineli]

Can you tell me how the question should be written? thanks!

[Mister Micawber]

.
For example:

Which of the following prepositions completes the sentence correctly?

The cook buys vegetables ___________ the market.

a. of b. at c. to
.
_________________
Native English teacher at Mister Micawber's

[Tespineli]

Got what you mean. thanks Mr. Micawber!