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

5' AACAGCGGUGCUAUU 3'

• A

  ${\text{Deletion of GGU from 7}}^{\mathrm{th}} , 8^{\mathrm{th}} \mathrm{and} 9^{\mathrm{th}} \mathrm{positions}$

• B

  ${\text{Insertion of G at 5}}^{\mathrm{th}} \mathrm{position}$

• C

  $\mathrm{Deletion} \mathrm{of} \mathrm{G} \mathrm{from} 5^{\mathrm{th}} \mathrm{position}$

• D

  $\mathrm{Insertion} \mathrm{of} \mathrm{A} \mathrm{and} \mathrm{G} \mathrm{at} 4^{\mathrm{th}} \mathrm{and} 5^{\mathrm{th}} \mathrm{position} \mathrm{respectively}$