Answer:
I believe it is B.
I am not sure if I am right, sorry if I am wrong.
Explanation:
Alleles are two different forms of a single gene.
The Hydroxyl group has solubility water.
I believe the answer is Sunlight.
In our world, the bimass of plants (which considered as living things) make up 1000 more population compared to another living organism.
The plants get their food mainly from the photosynthesis process that utilize Sunlight, water, and other nutrients from soil.