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'.
Mothers keep on (A)/ to encouraging their children (B)/ to study. (C)/ No Error (D)

Answer

2

Explanation

Keep on doing something =continue doing some thing. It is superfluous to use preposition to..
Don.t keep on interrupting met Keep on (at somebody) about something to speak to somebody often.
I will do it - just don.t keep on at me about it.