Geographers should learn to view the world from different to organize and categorize it.

Geographers should learn to view the world from different perspective to organize and categorize it.

Geography is to study the physical, biological, and cultural features on surface of the earth and the person who studies and categorizes these features is called a geographer.

A geographer also studies the earth’s natural environment and human society, they are usually misunderstood as the people who draw maps but that is a common mistake, drawing maps is actually called cartography, another field of geography. 

the answer to your question is,

d. when a child was born.

-mabel < 3