The correct response is:
Riley and Layla will each pay personal income tax on the portion of earnings that is theirs.
In a partnership, the partnership itself typically does not pay taxes on its earnings. Instead, the earnings pass through to the individual partners, who then report their share of the earnings on their personal tax returns and pay taxes accordingly. In this case, since Riley receives 80% of the earnings and Layla receives 20%, each will pay taxes on their respective portions.