In some regions where malaria is endemic, the frequency of the sickle-cell allele is as high as 15% due to heterozygous advantage for increased resistance to malaria. if modern technology were to completely eradicate malaria but not alleviate sickle-cell disease, what would be expected to happen to the sickle-cell allele frequency in subsequent generations? a) remain near 15%

b) gradually drop toward zero

c) drop slightly, then restabilize

d) rise slightly, then restabilize