The Reasons Why Per Capita GDP in the U

The reasons why per capita GDP in the U.S.is significantly higher than in some other rich countries like, say, France, include the following, except

A) substantially higher work hours put in by U.S.citizens than bycitizens of France.
B) cultural differences between the U.S.and France regarding the right balance between labor and leisure.
C) differences in the tax structure and the resulting incentive effects of taxes.
D) communication technology due to language differences.