What is the difference between obligate carriers and asymptomatic carriers? A….

What is the difference between obligate carriers and asymptomatic carriers?
A.     Asymptomatic carriers have the allele for the trait in their genotypes.
B.     Asymptomatic carriers will never exhibit the trait in their lifetime.
C.     Obligate carriers have the allele for the trait in their genotypes.
D.     Obligate carriers will never exhibit the trait in their lifetime.