Based on the likely full question (assuming List-I included Charles Darwin and Alexander Fleming, and List-II included Discovery of Deuterium and Discovery of Penicillin): - Gregor Mendel: Known as the father of modern genetics. Studied and taught at the University of Vienna. Thus, A maps to 2 (University of Vienna). - Harold C. Urey: American physical chemist, Nobel laureate for discovering deuterium (heavy hydrogen). Thus, B maps to 4 (Discovery of Deuterium). - Charles Darwin: Famous for his theory of evolution. Also wrote a book on the role of earthworms in soil formation and fertility. Thus, C maps to 1 (Role of earthworms in soil fertility). - Alexander Fleming: Scottish physician and microbiologist, Nobel laureate for discovering penicillin. Thus, D maps to 3 (Discovery of Penicillin).