Answer:
Supreme Court took primary responsibility
John the Baptist
Hope that helps :)
The correct answer is the option D.
As the United States entered the World War II they have started developing nuclear projects under the orders of the president Harry Truman. WW2 represented a massive arms race and president Truman believed that the Nazis have started developing a nuclear bomb, so he ordered that the US began the same project immediately in hopes of finishing before the Nazis.
I believe the answer is option D