Exxon Mobil reports Crude Oil Inventory of $$14$ billion, a LIFO Reserve of $$9\mathrm{.}7$ billion, Cost of Goods Sold of $$143$ billion, and Revenue of $$256$ billion. Exxon's FIFO inventory turnover ratio $($the adjusted ratio$),$ is approximately:

a$.10\mathrm{.}80$

b$.6\mathrm{.}03$

c$.10\mathrm{.}21$

d$.0\mathrm{.}17$