What was used by Germany during World War II as a weapon against London?

The V-2 rocket is recognized as the world's first long-range guided ballistic missile, developed by German engineers during World War II. It played a significant role as a weapon against London, marking a pivotal advancement in military technology with its ability to strike targets from a considerable distance. The V-2 was launched from launch sites in France and the Netherlands, delivering devastating payloads to the city and contributing to the Blitz, which aimed to demoralize both the British government and its civilians.

While the V-1 rocket was indeed another weapon used by Germany during the war, it was primarily a pulsejet-powered cruise missile, distinctly different in design and operation from the V-2. The other options listed, such as the Saturn V and the Redstone rocket, are not relevant to this context, as they were developed later in the United States for space exploration and not utilized during World War II. The Saturn V, for instance, was instrumental in the Apollo missions to the Moon, and the Redstone rocket was an early American missile used in the 1950s. Thus, the V-2’s specific technological advancements and its use in targeted attacks on London during the war solidify its place as the correct answer.