One of the main drawbacks to extinction is that:

The right options are; A, B, and E  

A. selling livestock  

B. making handicrafts, such as pottery  

E. selling crops

Nomadic people are group of people who have no fixed home but move from one place to another seasonally in search of food, water, grazing etc. Most nomadic people are herd’s men. They herd their livestock from pasture to pasture. Others are into trading (selling livestock, crops) while some make handicrafts such as pottery.