What did the National Consumers League do?

I believe the answer is C

sorry if I am wrong, its been a while since I did something like this

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added