Since you provide no option , one of the conclusion that the details support is that Oona wanted the readers to be able to vividly picture the travelling process to get a better reading experiences
hope this helps
<span>A. When is not answered.
(You could also argue that E: Where is not answered, although it is implied that it will be done nationally)
The sentence tells Who: The National Cereal Corporation, What: a free picture book, Where: Nationally, and Why: to promote reading</span>
