The study of legal policies is primarily associated with the field of law, which deals specifically with regulations and legal frameworks. While political science can involve aspects of legal study, it mainly focuses on governance and political behavior. Therefore, the correct answer to the question is D. law. ;
The field that studies legal policies is primarily law, which encompasses various legal frameworks and regulations. While political science, economics, and history may touch upon aspects of legal policies, they do not focus primarily on them. Therefore, the correct answer is option D. law.
;