Who built the world’s first liquid-fueled rocket?
the first man to give hope to dreams of space travel is american robert h. goddard, who successfully launches the world's first liquid-fueled rocket at auburn, massachusetts, on march 16, 1926.

The world's first liquid-fueled rocket was built by Robert Goddard.

Explanation:

Robert H. Goddard, one of the founding fathers of modern rocketry, was born in Worcester, Massachusetts, in 1882. At age 16, Goddard read the science fiction classic "War of the Worlds" by H.G. Wells, and dreamed of space flights. By 1926 he had designed, built and flown the world's first liquid-fuel rocket.

During his career, Goddard was ridiculed by the press for suggesting that rockets could fly to the Moon, but he continued his experiments, supported in part by the Smithsonian Institution and championed by Charles Lindbergh. Widely recognized as a talented experimenter and engineering genius, his rockets were many years ahead of his time.

Goddard was granted more than 200 technology patents, most until after his death in 1945. A liquid fuel rocket built on the principles developed by Goddard brought human beings to the moon in 1969.

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i would say b. research typically uses a variety of sources