Which Statement About the Difference Between a 4-Year-Old and a 9-Year-Old

Which statement about the difference between a 4-year-old and a 9-year-old is TRUE?

A) The 4-year-old can separate the relevant from the irrelevant, but the 9-year-old is unable to do so.
B) The 9-year-old can apply abstract thought to the classification process whereas the 4-year-old is unable to do so.
C) The 4-year-old will be able to think logically about concrete situations, whereas the 9-year-old is unable to do so.
D) The 9-year-old can use mental categories more flexibly, inductively, and simultaneously, whereas the 4-year-old is unable to do so.