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
Find the sequence in which the following milestones are attained? 
Select and explain. 
A. B → D → A → C, B. A → D → B → C, C. B → A → D → C, D. A → B → D → C
D: A → B → D → C
Answer: D: A → B → D → C 
Explanation: A → Simles at mirror image → 6 months
B → Sits without support → 8 months
D → Waves bye-bye → 9 months
C → Mature pincer grasp → 12 months