Why do sex-linked traits follow different patterns of inheritance than other traits? A. Males have two X chromosomes, and females only have one.
B. Males carry two copies of every sex-linked gene.
C. Males cannot carry recessive alleles for sex-linked traits.
D. Males only need one recessive allele to have a recessive sex linked trait.

I think option (C) is right answer

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

"do a testcross with a homozygous recessive plant."