In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If a sentence is free from error, your answer is (4) i.e.No. errorQuestion:Someone, they don't know (1)/ who, knocked at (2)/ their door in midnight. (3)/ No error (4).

In the following questions, some parts of the sentences have errors an

1.	In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If a sentence is free from error, your answer is (4) i.e.No. errorQuestion:Someone, they don't know (1)/ who, knocked at (2)/ their door in midnight. (3)/ No error (4).
A.	1
B.	2
C.	3
D.	4
Answer» D. 4