Reforming Tax Laws to Encourage Saving Is Motivated by Which

Reforming tax laws to encourage saving is motivated by which of the Ten Principles of Economics from Chapter 1?

A) The cost of something is what you give up to get it (Principle 2) .
B) Trade can make everyone better off (Principle 5) .
C) Markets are usually a good way to organize economic activity (Principle 6) .
D) A country's standard of living depends on its ability to produce goods and services (Principle 8) .