grammar of vocabulary tests?

[Rodley]

English Grammar Tests, Elementary Level

ESL/EFL Test #43 "Basic English Grammar", question 9

There are 12 ......... in a year.

(a) days
(b) weeks
(c) months
(d) hours

English Grammar Tests, Elementary Level

ESL/EFL Test #43 "Basic English Grammar", answer 9

There are 12 months in a year.

Correct answer: (c) months
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The question is not specific to grammar but it deals with measurement.

[Mister Micawber]

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No, it deals with vocabulary.
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Native English teacher at Mister Micawber's