Anyone should take her vacation through Rocky Mountains?

[VioletaNicoleta]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #703 "Pronoun Agreement (1)", question 1

Anyone who wants to see wild elk or deer should take ......... vacation through the Rocky Mountains.

(a) their
(b) our
(c) his/her

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #703 "Pronoun Agreement (1)", answer 1

Anyone who wants to see wild elk or deer should take his/her vacation through the Rocky Mountains.

Correct answer: (c) his/her
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I don't understand this either: Anyone should take her vacation through Rocky Mountains?
Is it a British English thing?

[Mister Micawber]

No. The idea is that in formal writing, the singular pronoun 'anyone' should be referenced by other singular pronouns, and 'his/her' is a formal way of referring pronomially without gender bias. In this kind of sentence, however, 'their' is just as acceptable and far more common.
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Native English teacher at Mister Micawber's