Which sentence is written in the passive voice?

a. marking the time in a notebook, he observed that his run was the best one yet.

b. evangeline decided to read a book because her favorite show was not airing this evening.

c. the entire box of books was lost in the cross-country move.

d. the children, tired after a long field trip, fell asleep early last night.

The novels The Maze Runner and The 5th Wave both have the theme of survival. They both surround(focus on) a select group of kids that have leaders with big decisions to make. The Maze runner has to escape a "prison/test" to survive. In the 5th Wave the characters are trying to survive what they think is an alien invasion. Its set in a more apocalyptic setting.