Rebecca Reads an Article in Her Daily Newspaper That Quotes

Rebecca reads an article in her daily newspaper that quotes a research finding that most babies start walking at the age of eight months.However,Rebecca's one-year-old daughter,Jenna,hasn't starting walking yet.Should Rebecca be concerned? Why?

A) Yes, since this finding has been proven by research.
B) Yes, since the finding is applicable to all the babies who are eight months and above.
C) No, since the finding cannot be generalized to all children who are developing normally.
D) No, since the finding is published in a newspaper and not in a scientific journal.