You Drive Your Car from Salt Lake City Up into the Mountains

You drive your car from Salt Lake City up into the mountains to go skiing. It is a nice day in Salt Lake, with a temperature of 16 $\degree$ C and an atmospheric pressure of 0.85 atm. Up in the mountains, it is freezing at -1.0 $\degree$ C and an atmospheric pressure of 0.70 atm. If the volume of air in your tires is 12 L when you leave the city, what is it in the mountains?

A) "-0.91 L"
B) "9.3 L"
C) "11 L"
D) "13 L"
E) "14 L"