Directions (66-70) : Read this sentence to find out whether there is any grammatical mistake/error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer.

If there is no error, mark 'No error' as your answer. Ignore the errors of punctuation, if any.
Once it was heard that / all the horses / in the village had / caught an unknowing disease.

A) Once it was heard that

B) all the horses

C) in the village had

D) caught an unknowing disease.

E) No error

Correct answer:
D) caught an unknowing disease.



Please provide the error details in above question