Sometimes errors occur during transcription or translation Examine the codon chart on the previous page. Notice that each amino acids coded for by several different codons. For example, alanine is coded for by GCU. GCC GCA and GCG
How might this offset transcription or translation errors 24

Please make sure that you post a complete question. This is the part missing:
- How might this offset transcription or translation errors?-

The existence of several codons that code for the same amino acid ensure that even when a mistake in the processes of transcribing the sequence from DNA to mRNA or translational errors, there is still a significant chance of correct amino acid being added to the protein.

Pretty sure it's E, Cleavage