Select the correct option to complete the narration of the dialogue between Abraham and his brother John.
Abraham : (humming) By the rivers of Babylon we sat and wept at the memory of Zion,.....
John : What are you singing, Abraham ?
Abraham : Dear me , don't you know its Psalm number 137?
John : If one priest found it difficult, then I'll keep asking, till you know about it!
While Abraham was singing, John asked him what he was singing. Abraham, surprised, asked John if he did not know that it was Psalm number 137. John exclaimed good-humouredly that if a priest found it difficult then____________
(a) he would kept asking till he know about it.
(b) he would keep asking till he knew about it.
(c) he would be keeping to ask until he came to know about it.
(d) None of the above