In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option . If a sentence is free from error, select 'No Error'.
It was by a mistake (1) / that Ankit caught (2) / Archana's hand. (3) / No error (4)

Answer

1

Explanation

by mistake = if you do something by mistake, you do it without intending to: accidentally. Look at the sentence: Someone must have left the door open by mistake. Hence. It was by mistake is the right usage.