Question about genotypes ?

Question

Which genotype provides the most benefits (with the least downsides) for individuals living in regions where malaria is common?

a.one sickle cell alleleb. no sickle cell allelesc. two sickle cell alleles d. it would be equally beneficial (with equal downsides) to have either one or two sickle cell alleles

Answer 1

a.one sickle cell allele = sickle cell trait. 

Answer 2

Your teacher wants this answer:

a. one sickle cell allele

But you know what?  It would help if you had panes in your windows and mosquito netting and DEET and DDT.