What is the primary cause of budgetary issues for the Social Security program? Question 4 options: a) The ratio of workers to retirees has declined sharply since the inception of the program. b) The federal government's debt-to-GDP (gross domestic product) ratio far exceeds earlier projections. c) The federal government has reduced the Social Security tax rate over time. d) The Social Security program has never been self-sustaining. e) Discretionary cuts that could easily have been made have not been made