Answer:
I believe the answers are: B) A Molecule is two or more atoms bonded together and: D) Compounds don't act like other elements.
The correct answer is selective breeding.
The selective breeding is the phenomenon in which two species with desired characters are mated. One specie is having one selected character and the other specie is having another selected character. Both having one desired character is mated to produce an offspring which is having both of the desired characters from both the parents. This is called selective breeding.
A carrier is an individual which has a heterozygous genotype.