Which of the Following Observations Led to the Discovery of Vitamin

Multiple Choice

Which of the following observations led to the discovery of vitamin A?

A) Chickens fed polished rice developed paralysis.
B) Children who regularly ate fish rarely developed a form of blindness common among children who did not eat fish.
C) Impoverished people eating a very low-quality diet were at high risk for developing pellagra.
D) Sailors on long sea voyages developed scurvy.