If a Nucleotide Substitution Switched a U for a C

Multiple Choice

If a nucleotide substitution switched a U for a C, such that the codon was read as CGC instead of CGU, what would the effect be?

A) a misfolding of the protein
B) an incomplete protein
C) nothing, as the third nucleotide does not determine the amino acid used.
D) nothing, since both these codons code for arginine
E) it would initiate a tumour