A Helium-Filled Balloon Has a Volume of 1 M³

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°C and 1 atm, and its final temperature and pressure are −40°C and 0.1 atm?

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