For free expansion of an ideal gas adiabatically , the correct option is

• A

  $\mathrm{q} > 0, \mathrm{\Delta T} > 0, \mathrm{W} > 0$

• B

  $\mathrm{q} < 0, \mathrm{\Delta T} = 0, \mathrm{W} = 0$

• C

  $\mathrm{q} = 0, \mathrm{\Delta T} = 0, \mathrm{W} = 0$

• D

  $\mathrm{q} = 0, \mathrm{\Delta T} < 0, \mathrm{W} > 0$