Both dave and caroline produce sweaters and socks. if dave's opportunity cost of producing 1 sweater is 3 socks, and caroline's opportunity cost of producing 1 sweater is 5 socks, then

a. dave has a comparative advantage in the production of sweaters.
b. caroline has a comparative advantage in the production of sweaters.
c. dave has a comparative advantage in the production of socks.
d. dave has a comparative advantage in the production of both sweaters and socks.

a. Dave has a COMPARATIVE ADVANTAGE in the production of sweaters.  

Explanation:

If both Dave and Caroline produce sweaters and socks. If Dave's opportunity cost of producing 1 sweater is 3 socks, and Caroline's opportunity cost of producing 1 sweater is 5 socks, then  Dave has a COMPARATIVE ADVANTAGE in the production of sweaters.

Comparative advantage can be defined as an economy's ability to produce goods and/or services at a lesser opportunity cost than other countries.

In the end comparative advantage gives a country the ability to sell those goods and services that he could produce at lower opportunity costs; cheaper to other countries.

This definition adequately describes the position  of Dave in relation to caroline, in the given Scenario.

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