It's about the invasion of D-Day, and how there was no susceptibility of a massive amphibious landing onto Normandy beach, that would cripple the entire German war effort, and would cause diversion of troops from the East to the West in a two front war.<span />
The answer is b: the native people lacked natural immunities
Lines of Lattitude and Longitude
Supporters of using the atomic bomb at the end of World War II believed that by using the bomb in the end, they will decrease the overall suffering and death that would be caused by a continuation of a prolonged conflict between the US, German and Japanese forces.