If Natural Selection Is Real, Why Do Lethal Recessive Disorders

If natural selection is real, why do lethal recessive disorders still exist in populations?

A) Recessive disorders most frequently do not manifest until later in life, after the individual has reproduced.
B) Recessive alleles remain hidden in carriers who are not affected by the disorder.
C) There may be an advantage to individuals who are heterozygous.
D) Recessive disorders most frequently do not manifest until later in life, after the individual has reproduced; and recessive alleles remain hidden in carriers who are not affected by the disorder.
E) Recessive alleles remain hidden in carriers who are not affected by the disorder; and there may be an advantage to individuals who are heterozygous.