The most relevant points regarding the impact of the D-Day invasion (Operation Overlord) on the outcome of World War II are:
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It allowed Allied troops to advance into Germany once France was free. - The successful landings in Normandy established a crucial foothold in Western Europe, enabling Allied forces to liberate France and subsequently push into German territory.
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It made it possible for British and American troops to fight with Soviet armies. - The opening of a Western Front relieved some pressure from Soviet forces on the Eastern Front, allowing for a more coordinated Allied strategy against Nazi Germany.
The other options do not accurately reflect the consequences of the D-Day invasion:
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It forced Germany to fight a war with the Soviet Union. - Germany was already engaged in a war with the Soviet Union since 1941, and the D-Day invasion did not force this situation but rather compounded the challenges Germany faced on multiple fronts.
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It provided Hitler with the means to invade Italy. - This statement is inaccurate; the D-Day invasion was an Allied operation against German-occupied France, and it was aimed at liberating Europe, not facilitating German invasions.
In summary, the most significant impacts of the D-Day invasion were its role in enabling Allied advances into Europe and establishing a Western Front against Germany.