What does this experiment indicate?

Correct: B. Because the RNA polynucleotide chain given contains only codons for phenylalanine (UUU). WRONG: A, because phen. and uracil are different chemicals and amino acids are not nucleotides. C: There has been no 'malfunction' as a chain of phen. is what would be produced. D: proteins contain up to 20 different amino acids never just one kind.