What is the primary reason that Woese and Fox choose the rRNA molecule to study phylogenetic relationships between organisms?

A)Ribosomal RNA is abundant in the cell.
B)Ribosomal RNA is a very stable molecule.
C)Ribosomal RNA is a molecule found in all living organisms.
D)Ribosomal RNA sequencing was very easy to perform at the time.
E)Ribosomal RNA is very easy to isolate and manipulate.