D. Established China and increased Trade<span />
The conflict most closely associated with events in Nanjing, Dunkirk, and Hiroshima is 3. World War II. During that war, the Japanese invaded and killed many Chinese in the Chinese city of Nanjing as they sought to increase their control of East Asia. Dunkirk was a period in World War II where British forces efficiently evacuated troops and civilians from Dunkirk in lieu of the coming German army. Towards the end of the war, the United States dropped the first atomic bomb on Hiroshima killing thousands of Japanese civilians.
B) An allele is one form of a gene.
A trait is usually determined by more than one gene, much less two traits, so A is false.
Alleles are a form of a gene, and any genes have usually two alleles, not the other way around, so C and D are both false.
