Which One of the Following Choices Provides the Best Example

Which one of the following choices provides the best example of social engineering?

A) An entrepreneur focuses his or her effort solely on buying and selling businesses in rapid succession.
B) An individual opens a series of shelters to help abused and battered women.
C) An entrepreneur launches a product designed to compete specifically in a profitable market.
D) An entrepreneur reengineers a product designed to help filter water in developed countries.