Researchers Found That Specific Combinations of Serotonin Transporter Alleles Affected

Researchers found that specific combinations of serotonin transporter alleles affected how students reacted to being bullied.Students with the SS alleles had the strongest reaction,those with the LL alleles the mildest reaction,and those with the heterozygous SL alleles reacted somewhere in between.What do these results suggest?

A) The L allele is the dominant allele.
B) The S allele is the recessive allele.
C) The S allele is the dominant allele.
D) The L and S alleles do not have a strict dominant-recessive relationship.