Which of the following occurs as a ribosome translocates along a mRNA molecule by one codon?A. The polypeptide enters the E siteB. The tRNA that was in the A site moves into the P site.C. The tRNA that was in the A site moves to the E site and is released.D. The tRNA that was in the A site departs from the ribosome via a tunnel.E. The tRNA that was in the P site moves into the A site.