Kati and Kiri are hosting a craft night at their business. Guests can choose to make a wreath (w) for $15, a mosaic tile (t) for $10, or paint an ornament (p) for $8. Which of the following expressions represents the total amount that Kati and Kiri will earn for the evening?
A. 15w + 10t + 8p
B. wtp
C. w + t + p
D. 23 (w + t + p)