A Transversion Somewhere Within Gene "B" in a Laboratory Plant

Multiple Choice

A transversion somewhere within gene "B" in a laboratory plant results in the production of a mutant mRNA that is much longer than the wild type.This transversion is most likely located:

A) downstream of the STOP codon,in the last exon of gene "B."
B) in an intron of gene "B" away from the splice sites.
C) in the open reading frame of gene "B."
D) within a splice site of gene "B."
E) within the promoter of gene "B."