This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
A 4 year child can perform which one of the following? 
Select and explain. 
A. Can hop on single leg for 15 feet, B. Can skip without falling to either side, C. Can stand on one feet for 20 seconds, D. Helps in household tasks.
A: Can hop on single leg for 15 feet
Answer: A: Can hop on single leg for 15 feet 
Explanation: Can hop on single feet for 15 feet- 4 yrs Can skip without falling to either side- 5 yrs Can stand one feet for 20 seconds- 5 yrs Helps in household tasks- 5 yrs.