The factor most contributed to the defeat of german at Stalingrad in 1943 is The Russian winter. Thus the correct answer is A.
What was the impact of the Russian winter?
The Russian winter during the war was so cold which lead to freezing of german tanks and create great challenges for the German military who does not wear any coats or boots to escape from freezing cold.
The Russian army haver experience in living in this kind of situation, so they have a survival kit to make them protect from the cold which helps them to win the battle.
Therefore, option A Russian winter shows the climatic conditions leading to german soldiers getting exhausted and facing the problem of minimum supplies.
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