12. Mariya runs a small cafe where she makes sandwiches and sells coffee. There isn't room for a second person so Mariya works alone. Mariya buys a new coffee machine that allows her to brew her coffee more cheaply. Mariya should

A) make more sandwiches and sell more coffee.

B) make fewer sandwiches and sell less coffee.

C) make more sandwiches and sell less coffee.

D) go back to the old coffee machine.

E) make fewer sandwiches and sell more coffee.