Final answer:
Robert Capa's D-Day photos became the first seen by the world due to his presence on the Normandy beaches and the subsequent publication in Life magazine, despite a darkroom accident destroying most of his negatives.
Step-by-step explanation:
The photos taken by Robert Capa during D-Day became the first the world saw due to Capa's presence on the beaches of Normandy as an embedded photojournalist with the invading Allied forces. He captured the harrowing experience of soldiers as they landed and faced the intense German defenses. Unfortunately, the majority of Capa's negatives were destroyed in a darkroom accident; however, a few surviving images, blurry and grainy, still powerfully conveyed the chaos and horror of the invasion. These images were published in Life magazine and came to symbolize the brutal realism and human cost of the war. The story behind those photos underscores the perilous work of war photographers and the impact of their work in shaping historical memory.