Three identical, sealed balloons each contain the same amount of ideal gas at pressure P0, volume V0, and temperature 300K.
• Balloon A is heated at constant volume to 450K.
• Balloon B expands at constant pressure until its volume doubles.
• Balloon C is compressed isothermally until its volume is halved.
Which ranking correctly orders the final pressures of the balloons from lowest to highest?
a) C < A < B
b) B < C < A
c) B < A < C
d) C < B < A