Under which of the following conditions will there be no change in the reading frame of following mRNA ? 5'AACAGCGGUGCUAUU3'

Question

( A ) Insertion of G at 5th position
( B ) Insertion of A at G at 4th and 5th positions respectively
( C ) Deletion of GGU from 7th, 8th and 9th positions
( D ) Deletion of G from 5th position