Economists Are More Concerned About the Public Debt Than About

Economists are more concerned about the public debt than about the gross federal debt because:

A) sale of Treasury securities to the public acquires resources that otherwise might be invested in the private sector.
B) buying Treasury securities from the public acquires resources that otherwise might be invested in the private sector.
C) adding federal securities to and subtracting them from the government's trust fund effects private investments positively.
D) adding federal securities to and subtracting them from the government's trust fund effects private investments negatively.