Banks Are So Much More Highly Leveraged Than Non-Financial Firms

Banks are so much more highly leveraged than non-financial firms because choose the best answer) :

A) deposits are a factor of production in banking and deposits are considered debt.
B) deposit insurance provides banks with a safety net.
C) equity in banking is inherently more costly than in non-financial firms because bank investors want higher returns.
D) bankers love financial risk.