A Helium-Filled Balloon Has a Volume of 1 M3 $\degree$ C and 1 Atm, and Its Final Temperature and Pressure

Multiple Choice

A helium-filled balloon has a volume of 1 m3. As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20 $\degree$ C and 1 atm, and its final temperature and pressure are -40 $\degree$ C and 0.1 atm?

A) 4
B) 6
C) 8
D) 10
E) 1.5