Potential Problem(s) of the National Debt Is/are

Potential problem(s) of the national debt is/are

A) government borrowing may crowd out private investment.
B) interest payments on the debt may be a burden for future generations if the debt is largely held by non-Canadians.
C) high interest payments on the debt may create self-perpetuating debt.
D) going into debt to finance consumption.
E) all of the above.