Considering the available options, the reason for Allied victory supported by the chart is "a greater number of troops."
This is evident in that during world war II when the Allied power faced the Axis power, the Allied force had over 42 million soldiers, which are dominated by the Russians, and French Soldiers, including Americans and British.
World War II was a war that resulted in the death of millions, but in the end, the Allied power won due to many factors, including more troops.
Hence, in this case, it is concluded that the correct answer is option B. "a greater number of troops."
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