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: Pediatrics
Which one of the following activities cannot be formed by a 7 month old infant – 
Select and explain. 
A. Pivot, B. Cruise, C. Transfer objects, D. Enjoy mirror
B: Cruise
Answer: B: Cruise 
Explanation: None