The correct option is C Emu
The emu is the largest bird which is the native to Australia and the only extant member of the genus Dromaius. It is a flightless bird and so it has adapted to cursorial adaptation. So, in such running birds, the legs are powerful and the number of toes is reduced. In emu, only 3 toes, directed forward are present.
Thus, the correct answer is (C), Emu.