In the following representation of a single-stranded RNA molecule, the nucleotide residues are drawn as gray circles, while base-pairing interactions between them are indicated by dashed lines. The structure of this RNA molecule has...
A) one hairpin loop and one pseudoknot. B) one pseudoknot only. C) three hairpin loops and a four-stem junction. D) two hairpin loops and a three-nucleotide bulge. E) three hairpin loops.