Translational Readthrough Occasionally Occurs in the Coat Protein Gene of the SsRNA

Translational readthrough occasionally occurs in the coat protein gene of the ssRNA phage Q $\beta$ .Which of the following describes this process?

A) The stop codon (UGA) is read as a tryptophan codon (UGG) .
B) The RNA-dependent RNA polymerase reads into the next gene.
C) The RNA-dependent RNA polymerase inserts an extra base in this gene.
D) The ribosome shifts back one base and reads a different reading frame.
E) The ribosome shifts forward one base and reads a different reading frame.