A certain gene found in a diploid species is known to have 18 alleles (variants).Any given organism of that species can/must have which of the following?

A)2 alleles for that gene
B)up to 18 chromosomes with that gene
C)up to 18 genes for that trait
D)a haploid number of 9 chromosomes
E)up to, but not more than, 18 different traits