During rna processing a(n) is added to the 5' end of the rna. during rna processing a(n) is added to the 5' end of the rna. 3' untranslated region a long string of adenine nucleotides 5' untranslated region coding segment modified guanine nucleotide

During RNA  processing a(n) a long  string  of  adenine  nucleotide  is  added  to  the 5  end   of  the  RNA.  3  untranslated region a  long  string  of  adenine  nucleotide  5   untranslated  region  coding segment  modified guanine nucleotide.These   happens  before RNA  is  transported  out  of  the  nucleus  and translated into  protein

Ithink it’s b but not 100% sure