Some of the sentences are grammatically correct and some are incorrect. Find out which part of the sentence has an error and mark that part. If there is no error , mark that part as your answer.
`("Hardly the inspector had arrived there")/a` `("to investigate the crime")/b` `("when the house was set ablaze")/c` `("No error")/d`

Explanation

(a) Say .had the inspector.