This question requires identifying the grammatical error in the given sentence. The sentence is: "Have you ever met such a boy who has not travelled by train?" Let's analyze the sentence part by part:
Since all parts of the sentence are correctly structured, the correct answer should be (d) "No error." However, if following the options provided, (c) was marked as the correct answer, which may have been intended as a misinterpretation or typo in the context.
Identify the part of the sentence that contains an error:
"Neither the manager nor the employees ___ willing to accept the new policy."