Answer:
Since we see more than one kid trying to read the book
we can said it's <em>A. El libro es interesante.</em>
since if you see the option b it's the notebook is green (that is not a notebook less it's green)
c is the computer is blue ( we don't see a blue computer on there)
and d the teacher is small (on the photo the teacher it's not on there, so we can't said if she/him is small or tall)
If the question is to make it into a proper sentence then you take out en so it says, Muchos jóvenes llevan todo lo que necesitan cuando viajan.
The answer is inesperados.
