Below are given some sentences out of which the sentence numbered 4 has been correctly placed. The rest of the sentences A, B, C, D, E, F need to be arranged correctly in order to form a logical order.

1. It was also the only war that involved the use of nuclear weapons in war.
2. World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945.
3. A state of total war emerged, directly involving more than 100 million people from over 30 countries.

4. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources.

4. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis.
5. World War II was the deadliest conflict in human history, marked by 70 to 85 million fatalities, most of whom were civilians in the Soviet Union and China.
6. It included massacres, the genocide of the Holocaust, strategic bombing and premeditated death from starvation and disease.