Conscription is also referred to as drafting in the United States and it refers to the compulsory enlistment of people into the national service.
Therefore, the statement "Conscription into the armed forces is no longer practiced in the United States" simply means "Drafting into the armed forces is no longer practiced in the United States".
The answer is, B) In "How Old Man Winter Was Driven Back," the change in seasons is shown as a violent battle. In "How the World Was Made," the change in seasons is shown as a natural, peaceful transition.