The pressure and volume of a gas are changed as shown in the $P-V$ diagram in this figure. The temperature of the gas will ........
  • AIncrease as it goes from $A$ to $B$
  • BIncrease as it goes from $B$ to $C$
  • C
    Remain constant during these changes
  • DDecrease as it goes from $D$ to $A$
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