What rung of the Cosmic Distance Ladder is most appropriate for the incorrect choice's above?

Parallax
Main sequence fitting
Variable stars
Type 1a supernovae
Hubble's Law

Urgent in guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?