Which measure will prevent the majority of human blindness in developing countries? 

A)  administration of immunizing shots 
B)  administration of vitamin A capsules 
C)  administration of iodine 
D)  administration of sugar and salt dissolved in a glass of water

Human Blindness

A condition where a person lacks visual perception due to physiological or neurological factors.

Vitamin A

A fat-soluble vitamin important for normal vision, immune system function, and reproduction, found in foods such as carrots, spinach, and dairy products.

Developing Countries

Nations with a lower living standard, undeveloped industrial base, and low Human Development Index relative to other countries.