The ability to taste the chemical PTC is determined in humans by a dominant allele T, with tasters having the genotypes Tt or TT and non-tasters having tt. If you discover that 36 percent of the members of a population cannot taste PTC, then according to the Hardy-Weinberg rule, the frequency fo the T allele should be:

a. 0.4
b. 0.6
c. 0.64
d. 0.8