53. As a ribosome translocates along an mRNA molecule by one codon, which of the following occurs? (A) The tRNA that was in the A site moves into the P site. (B) The tRNA that was in the P site moves into the A site. (C) The tRNA that was in the P site moves to the E site and is released. (D) The tRNA that was in the A site departs from the ribosome. (E) Both A and C are correct.