Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure.

AB $\to$ Isothermal expansion
AC $\to$Adiabatic expansion
Which of the following options is not correct?

Since graph A to C represents adiabatic reversible expansion, so work is done at the expense of internal energy, therefore, there is decrease in internal energy. So the temperature decreases.

$\text{ i.e., }{\mathrm{T}}_{\mathrm{C}}<{\mathrm{T}}_{\mathrm{A}}$