What does 'multiple choice test' mean?

[Ronys]

English Language Tests, Intermediate level

ESL/EFL Test #710 "In the classroom", question 6

We call this type of exercise a ......... choice test.

(a) multiply
(b) manifold
(c) multiple

English Language Tests, Intermediate level

ESL/EFL Test #710 "In the classroom", answer 6

We call this type of exercise a multiple choice test.

Correct answer: (c) multiple

Your answer was: incorrect
We call this type of exercise a manifold choice test.
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can you explane?

[Mister Micawber]

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Look HERE.
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Native English teacher at Mister Micawber's