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'.
No beggar who comes(A)/to our doors(B)/goes back empty handed. (C)/No error(D)

The idiom "come to someone's door" is usually singular when referring to a household or doorstep entry point in this context. However, "comes to our doors" or "comes to our door" are both acceptable, and the rest of the sentence is grammatically sound, maintaining subject-verb agreement ("No beggar... goes back"). No significant error exists.