Widespread Mobile Phone Use Has Helped to Reduce Poverty in Many

Widespread mobile phone use has helped to reduce poverty in many poor nations.What is the best explanation for this?

A) People are now able to call for help more easily when they are victims of crime.
B) People can access markets and services that they had no access to previously.
C) People can write apps for phones and sell them, allowing them to earn their way out of poverty.
D) People have more access to knowledge, allowing them to gain information and education like never before.