Which of the following best describes the change in kdr genotype frequencies over time in a. gambiae? a)from pre-2006 to post-2006, the frequency of the r/r genotype increased slightly while the frequencies of +/+ and +/r genotypes decreased dramatically. b)from pre-2006 to post-2006, the frequency of the r/r genotype increased dramatically while the frequencies of +/+ and +/r genotypes decreased dramatically. c)from pre-2006 to post-2006, the frequency of the r/r genotype increased dramatically while the frequencies of +/+ and +/r genotypes remained relatively constant. d)from pre-2006 to post-2006, there was little change to the r/r, +/+, and +/r genotype frequencies.