What Does Governor Jerry Brown Mean by the "Wall of Debt

What does Governor Jerry Brown mean by the "Wall of Debt" that California faces?

A) State debt is so high that it is now impossible to write a budget without a deficit.
B) High debt has accumulated from selling bonds to close the budget gap, borrowing from accounts intended for other purposes, and unemployment insurance loans from the U.S.government.
C) California borrowed stimulus funds and now must repay billions of dollars to the federal government, because it can't account for how the money was spent.
D) Every year the state sells more general obligation bonds, and they are unlikely to be repaid.