This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
According to Labyrinthine reflex, when head is tilted backwards it will cause the: 
Select and explain. 
A. Back to stiffen or arch backwards, B. Legs straighten and push together, C. Arms to bend at elbows and hands to become fisted., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None