Question tag: isn't she?

[Wisemarie]

English Language Tests, Intermediate level

ESL/EFL Test #238 "Question Tags Test (1)", question 2

She's from Korea, .........?

(a) was she
(b) isn't she
(c) could she

English Language Tests, Intermediate level

ESL/EFL Test #238 "Question Tags Test (1)", answer 2

She's from Korea, isn't she?

Correct answer: (b) isn't she
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is "a" also a possible answer to the question?

[Kitosdad]

Sorry Marie .... no.
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