Humphries has cash of $$5,000,$ marketable securities of $$5,000$ and accounts receivable of $$2,500,$ accounts payable of $$900,$ and inventory of $$1,200.$ What is the value of the quick ratio?

a$.9\mathrm{.}12$

b$.12\mathrm{.}89$

c$.13\mathrm{.}89$

d$.15\mathrm{.}22$

e$.8\mathrm{.}332$