The scientist associated with radiation and pioneering work on radioactivity is:

• A. Albert Einstein
• B. Isaac Newton
• C. Nikola Tesla
• D. Marie Curie

Answer: (D)

Recognizing the scientist most closely tied to radiation and early radioactivity research helps you pick the right answer. Marie Curie stands out because she advanced the study of radioactivity after Becquerel’s discovery, coined the term itself, and helped isolate the elements polonium and radium. Her careful measurements and experimental methods solidified the field and she earned Nobel Prizes for her work in physics and chemistry. The other names are known for different breakthroughs—Einstein for relativity and the photoelectric effect, Newton for classical mechanics and gravity, Tesla for electrical engineering and AC power. So, Marie Curie is the best fit.