The correct option is
C Very thin
'Emaciated' means very thin and weak.
Option A - 'Very tall' means someone who has more than average height. Thus option A is incorrect.
Option B - 'Very sleepy' means tired and wanting to sleep. Thus option B is incorrect.
Option D - 'Very aged' means very old. Thus option D is incorrect.
Option C - 'Very thin' means very weak and someone who has less flesh on the bones. Thus option D is the correct answer.
'Emaciated - Very thin'