Why Is the Following Parent's Story from the Book a Rationale

Why is the following parent's story from the book a rationale for inclusion?
Andrea came back from preschool saying she wanted to invite Katie home for lunch the next day. I could not figure out who Katie was. Andrea tried to describe Katie's hair, then their new jacket, then their paintings. I still couldn't place them. Finally, Andrea said, "Katie's the one who comes with shiny ribbons in their hair," and I knew immediately who Katie was. She was the child in the wheelchair who always had big colorful bows at the ends of her braids! Apparently, using a wheelchair was not one of Katie's outstanding characteristics for my child.

A) Children develop at different rates.
B) Unless otherwise influenced, children at a young age seldom have trouble accepting those who are different.
C) The majority of young children will acquire basic development on their own.
D) Young children with disabilities are entitled to the same experiences as children who are typically developing.