Taste molecules are unique because different molecules trigger in the nose and mouth

taste and smell

Explanation:

triggers taste

example

hold your nose put a fruit candy in your mouth you will notice there will be a slight different taste

these molecules trigger basic taste

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.

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.