Answer: Japan ; Japan
Explanation:
Absolute advantage in the production of a good means that one is able to produce more of the good in a certain period of time. This can also mean that they take a shorter time to produce a single unit of a good.
Going by this definition, Japan has an absolute advantage in the production of both sedans and trucks because they take less time to produce both types of vehicles which means that they can produce more of both than the United States if given a certain period of time.