some of the sentence are grammatically correct and some are incorrect. Find which part of the sentence has an error and mark that part. If there is no error,mark that part as your answer
`("Scarcely had")/a` `("I arrived than")/b` `("the train left")/c` `("No error")/d`

Answer

2

Explanation

when will replace than because
hardly, barely, scarcely, etc. are followed by when and not than. No sooner is followed by than.
Look at the examples given below
Hardly had I anived home when my phone rang. Scarcely had she finished reading when she fell asleep.
Hence, I arrived when is the right usage.