What additional information would be most in determining whether pigs are more closely related to hamsters than they are to mice?

a.) the percent difference between hamster and pig amino acid sequences in the zp3 protein
b.) the number of amino acids present in the zp3 protein in mice and pigs
c.) the number of amino acids present in the zp3 protein in hamsters and pigs
d.) the percent similarity between mouse and pig amino acid sequences in the zp3 protein