In a closed population, squirrel teeth can be either long or short. The long teeth allele is classically dominant. If there are 320 squirrels with long teeth and 40 squirrels with short teeth, what is the frequency of heterozygotes? Round to 2 decimal places.
(A) 0.11
(B) 0.33
(C) 0.44
(D) 0.67