The correct answer is C. W. K. Roentgen.
Roentgen was a German physicist who discovered X-rays in 1895. He was experimenting with cathode rays in a vacuum tube when he noticed that a nearby screen coated with barium platinocyanide began to glow. He realized that the rays were passing through the glass of the tube and causing the screen to fluoresce. He called these rays “X-rays” because their nature was unknown at the time.
Roentgen’s discovery of X-rays was a major breakthrough in medical imaging. It allowed doctors to see inside the body without surgery, and it revolutionized the diagnosis and treatment of many diseases. X-rays are still used today in a wide variety of medical applications.
A. Ross Ronald was a Scottish physician who is best known for his work on the transmission of malaria. He was not involved in the discovery of X-rays.
B. H. C. Urey was an American chemist who won the Nobel Prize in Chemistry in 1934 for his discovery of deuterium. He was not involved in the discovery of X-rays.
D. G. Marconi was an Italian inventor and electrical engineer who is best known for his work on radiotelegraphy. He was not involved in the discovery of X-rays.