X-rays were discovered by ____.

Roentgen

The correct answer is Option (3) → Roentgen

X-rays were discovered by Wilhelm Conrad Roentgen, a German physicist, on November 8, 1895. Roentgen's discovery of X-rays revolutionized the field of medicine and had significant applications in various scientific and industrial fields. For his discovery, Roentgen was awarded the first Nobel Prize in Physics in 1901.