What notable achievement took place in figure skating at the 1956 Cortina D'Ampezzo Olympics?

The notable achievement in figure skating at the 1956 Cortina D'Ampezzo Olympics was the completion of a men's singles sweep. This means that the top three podium spots in the men's singles event were filled exclusively by competitors from a single country, reflecting a dominant performance in the discipline at that time.

The significance of this accomplishment lies in how it highlights not just individual excellence, but also the strength and depth of talent from a particular nation in figure skating, especially during an era when the sport was highly competitive. This event contributed to the nation's reputation in winter sports, showcasing its ability to produce elite athletes in figure skating.

The other options pertain to either women's achievements, pairs events, or ice dance, which did not have the same level of remarkable dominance as seen in the men's singles competition during those Olympics. Thus, the men's singles sweep stands out as the primary notable achievement in figure skating at the 1956 Games.