I believe the answer is B
A "rational" use would mean a compromise between different interest and would also take into account scientific knowledge. Therefore neither a complete ban or unconditional permission on lumbering are rational.
A correct answer is
D. National forests should be protected to make the best use of the nation's natural resources.
Modern weapons would be considered the aspect of the war that causes the largest amount of casualties. The world feared that a Cold War would eventually trig ger another world war wherein the progressive production of nuclear bombs between the superpowers of the United States and Soviet union would lead to huge casualties across the globe.
To ensure that their facts that they are studying are correct.
