Our actions could be voluntary and involuntary. From the given list of actions, identify involuntary actions (i) Chewing of food (ii) Digestion of food (iii) Heart beating (iv) Breathing (v) Dancing (vi) Singing (vii) Standing upright.

• A.  (ii), (iii) and (iv) only      
• B.  (i), (ii), (iii) and (iv) only
• C.  (v), (vi), (vii) and (i) only                   
• D.  All of these