The D-Day invasion in June 1944 was important to the outcome of World War II because it Opened a new Allied front in Europe
Avoided use of the atomic bomb against civilian targets
Forced Italy to surrender
Stopped Soviet advances in eastern Europe

Opened a new Allied front in the Europe

Explanation:

There was only one front after the fall of France which were the Soviet. Soon after another front was created in Italy, where Italy negotiated for peace meaning another front was created. Then the success of the D-day, landing allowed for a 3rd front to open up, which spread the German soldiers very thin.

Soviet was a de facto ally of the Entente so it cannot be the fourth one. Italy only surrendered because the war was growing unpopular in Italy and Benito was toppled from power. They also surrendered as the Entente had got a holding of Sicily so it cannot be the third one. It cannot be the second one, as I am pretty sure that the Luftwaffe would have prevented this from ever happening

option b, all states follow similar rules and legal process is the right answer.

the 14th amendment in the constitution of america was enacted in july 1868, which include the citizenship, due process, and the equal protection under the law. this amendment was a response to the issues related to former slaves following the american civil war.

the citizenship clause granted citizenship to all persons born or naturalized in the u.s,.   due process of clause asserted that states may not deny any person "life, liberty or property, without due process of law and the equal protection clause declared that a state may not deny to any person within its jurisdiction the equal protection of the laws. the above mentioned excerpt from the constitution of the united states, ensures the citizenship,due process, and equal protection under the law.