The statement that accurately compares public debt to intragovernmental debt is:
Public debt is securities issued by the Treasury to investors while intragovernmental debt are loans within the federal government from the excess funds of other agencies.
This reflects the distinction between public debt (which is the total amount of money that the government owes to external creditors) and intragovernmental debt (which is money that one part of the government owes to another part, often represented by funds held in special accounts).