Directions: The following sentence has been split into three parts (A), (B) and (C). If there is any grammatical error in any of these parts, that is the answer. If there is no error, the answer is (D).

I had been taking a bath (A)/ when someone knocked (B)/ at the door. (C)/ No error (D)

This is the correct option as this part of the sentence has the error. Here, an incorrect past perfect continuous tense (had been taking) has been used in place of past continuous tense (was taking). Past continuous tense is used to indicate uncompleted actions of the past, with or without time reference. The correct sentence would be, “I was taking bath when someone knocked at the door”.