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 profits are passed through to the partners, who then report and pay taxes on their respective shares of the earnings on their personal tax returns. Therefore, Riley will pay taxes on 80% of the earnings, and Layla will pay taxes on 20% of the earnings. The partnership itself does not pay taxes on the earnings before distribution; instead, it is the individual partners who are taxed based on their share of the profit.