The two air-to-surface weapons used during World War II were the V1 and V2. The V1 flying bomb, also known as the "buzz bomb," was utilized by Germany as an early cruise missile. It was designed to carry explosive payloads over a distance and was launched from ground sites. The V2 rocket, on the other hand, was the world’s first long-range guided ballistic missile, also developed by Germany. It marked a significant advancement in technology for delivering explosive payloads over a longer range and at higher speeds, impacting both military tactics and post-war missile development.
The other options do not fit the criteria of air-to-surface weapons used in that particular era. The B29 and B17 refer to bombers, while Tomahawk and Harpoon are modern cruise missiles developed long after World War II. The Silkworm and Styx missiles were also developed later, in the post-WWII era. Hence, the V1 and V2 stand uniquely as the air-to-surface weapons utilized in World War II.