Justice, honesty, courage, empathy
The correct answer is D. Subject
The subject is the person/thing that does the action. In his case, it contains something which makes it the doer of the action of containing.
In "the fun they had . " tommy finds a book. The book's pages are yellow and crinkly because it was an old book which excited nearly a 100 years ago when the books were printed in spite of being saved and shown in the television screen that tommy and Margie had.