18. The following codons and the amino acids they encode is as follows: AUG = Start or Met； UUU, UUC = Phe； UUA, UUG = Leu； UCU, UCC = Ser； CCU, CCC = Pro； ACU, ACC = Thr； UGA = Stop. The 5’ACU-UUC-ACU-AUG-UUU-UUA-UCC-UCC-ACU-CCU-UGA 3’ mRNA transcript results in which of the following polypeptide sequences? (A) Thr-Phe-Thr (B) Phe-Leu-Ser-Ser-Thr-Pro (C) Thr-Phe-Thr-Phe-Leu-Ser-Ser-Thr-Pro (D) Met-Phe-Leu-Ser-Ser-Thr-Pro