During the Elongation Cycle of Translation, the a Site on a Ribosome

During the elongation cycle of translation, the A site on a ribosome functions in

A) receiving a new tRNA with the correct amino acid.
B) holding a polypeptide as amino acids are added.
C) attaching the small subunits of rRNA to the large subunit.
D) releasing the completed polypeptide.
E) processing the rRNA. During the elongation cycle, an incoming tRNA carrying the specified amino acid binds to the anticodon of the mRNA at the A site of the ribosome.