Deposit Insurance Only Seems to Be Viable at the Federal

Deposit insurance only seems to be viable at the federal level. This is likely due to the fact that:

A) state funds are less informed about the solvency of national banks.
B) a run on the banks within a state will always spread countrywide.
C) the U.S. Treasury backs the FDIC and can therefore withstand virtually any crisis.
D) the cost of state insurance is prohibitively high.