Direction: In the following questions, some parts of the sentences have errors and some have none. Find out which part of a sentence has an error. The number of that part is your answer. If a sentence is free from error, your answer is (4), i.e. No error.
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					 Solve the question according to given instruction
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                        - When she knocked the door,
- I said to her,
- “come in.”
- No error
 
Correct Option: A
knocked at the door will replace knocked the door 
knocked (Verb) agrees with at (Prep.) 
Hence, When she knocked at the door is the right usage.
 
	