Final answer:
Broad constructionists believe in an open-minded interpretation of the Constitution, allowing for broader Congressional powers and adapting to societal changes.
Step-by-step explanation:
The individual who believes there should be an open-minded interpretation of the Constitution and allows Congress to have broad powers is D. Broad constructionists. This view is often associated with the theory of the Constitution being a living document, which should adapt to changing times and societal needs. Broad constructionists are compared to judicial activists, who are open to interpreting the Constitution in a way that responds to modern values and circumstances, often resulting in the expansion of individual liberties and the broadening of Congressional powers.