Answer:
B. different, including meeting milestones a little early or late, and not progressing in each domain at the same time.
Step-by-step explanation:
There are some standards that have been set regarding the ages in which infants reach certain milestones but they don't tend to give a specific age in which the infant has to do it. Instead of that, ranges are established because every kid is different and one accomplish certain things first and for other milestone can take a little longer than other kids. Parents shouldn't worry about this because it is normal in their development. According to this, the answer is that you should expect each child's development to be different, including meeting milestones a little early or late, and not progressing in each domain at the same time.