It is possible to recognize a person in the dark by simply hearing his unique voice . It is because of the__?

✅ C. 1609.34

✅ A. Astronomy

✅ D. Crust, Mantel, Core

✅ B. Dactylography

✅ B. Chromium

✅ A. Amonia solvay process

✅ B. Tooth enamel

✅ A. Gastric Juice