Which most contributed to the Battle of Stalingrad becoming a turning point in the war?

The battle marked the beginning of Germany’s victory.
The German army exhausted all of their supplies.
The battle marked the end of Germany’s advancement.
The German army gained hundreds of additional soldiers.

Option A, implied is the right answer.

By contrast, the Necessary and Proper Clause clearly grants incidental authorities upon Congress. This Necessary and Proper Article is sometimes called the elastic clause. This clause comes under the section VIII of the Article I, in the constitution of the United States. The Necessary and Proper clause empowered the Congress to enact the regulations required for the performance of its other authorities instituted by the Constitution. Therefore, this  Necessary and Proper Clause provided Congress with the implied powers.