It really depends, think of it as 2 light bulbs in each parent. if both light bulbs in both parents are switched on that means their genes that they inherited are only able to have brown eyed babies, although if just 1 of the 4 light bulbs are not on it allows the baby to have blue eyes.
The answer is fatty acids
It would not be answer C because a majority of supplements are not approved by the FDA. This does not make them anymore effective. The answer is D.