The Figure Above Shows Liz's and Joe's Production Possibilities for Salads

The figure above shows Liz's and Joe's production possibilities for Salads and Smoothies.
-Liz has a comparative advantage in ________ because ________.

A) smoothies; her opportunity cost of producing smoothies is lower than Joe's
B) salads; her opportunity cost of producing salads is lower than Joe's
C) smoothies; she can produce more smoothies per hour than Joe can
D) salads; she can produce more salads per hour than Joe can
E) both goods; she can produce more of both goods per hour than Joe can