Frankie: If jelly makers were given incentives to make a certain percentage of their jellies from cloudberries, income for cloudberry gatherers would increase. Anna: That plan would fail. Cacao, like cloudberries, was once harvested from wild plants. When chocolate became popular in Europe, the cacao gathers could not supply enough to meet the increased demand, and farmers began to grow large quantities of it at low cost. Now all cacao used in commercial chocolate production is grown on farms. Likewise, if the demand for cloudberries increases, domesticated berries grown on farms will completely supplant berries gathered in the wild. Anna's argument proceeds by ['proposing a general theory as a way of explaining a specific market situation', 'giving a reason why a proposed course of action would be beneficial to all those affected by it', 'projecting the result of following a proposal in a given situation by comparing that situation with a past situation', 'contending that the uses for one product are similar to the uses for another product']