You are interested in designing an experiment to test the hypothesis that frogs use the same genetic code as humans. Which of the following experiments would not give you useful data to test this hypothesis

A) Purify tRNAs from frog cells and human cells and compare their structures
B) Insert a human gene into frog cell and see if the correct protein is produced
C) Insert a frog gene into human cell and see if the correct protein is produced
D) Compare nucleotide sequences of promotrs from similar frog and human genes