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 earnings are typically passed through to the partners, who then pay personal income tax on their respective shares of the earnings, which in this case is 80% for Riley and 20% for Layla. The partnership itself does not pay taxes on its earnings; instead, the individual partners report their share of the profits on their personal tax returns.