Answer:
b. 1 pound of ice cream for Ben and 1 pound of cones for Jerry.
Step-by-step explanation:
Ben and Jerry both produce ice cream. They can have comparative advantage with producing the specialized product. Ben can gain from the trade if it produces more of ice cream and less or no cones. Jerry would gain the comparative advantage if it would produce cones for the ice cream. Both of them can have comparative advantage by selling the specialized products to each other.