Which of the following sentences contains an infinitive?

How does the author use structure to create tension in the excerpt

Even the insistent cough of the woman next to him wasn't enough to draw his eyes away from the tiny type of the ancient book its pages were brittle and felt like they could crumble at the slightest disturbance he noticed the musty odor if each page as he carefully it over.

Hyperbole in the book messenger by lois lowry