Iranian Book Celebrating Suicide Bombers Found in Arizona Desert

This sounds mysterious somewhat, and the article doesn't clear the mystery:

A book celebrating suicide bombers has been found in the Arizona desert just north of the U.S.- Mexican border, authorities tell Fox News. The book, "In Memory of Our Martyrs," was spotted Tuesday by a U.S. Border Patrol agent out of the Casa Grande substation who was patrolling a route known for smuggling illegal immigrants and drugs.

To help you with the solution, I have prepared here a multiple choice quiz. So, the way this book got to US territory was:

1. Dropped from a plane / hot air balloon by a forgetful passenger
2. Lost by a drug smuggler on the way into Arizona
3. Lost by an illegal alien on the way into Arizona
4. Fell from a Jeep, being a personal possession of the Border Patrol agent and got lost during a chase
5. Some darn tourist from Boise, Idaho lost it
6. The book got slung into Arizona by a catapult these dastardly boys of Sinaloa drug cartel use near the border fence. This is done to demoralize and to confuse the troops
7. A Muslim martyr(s) to be is(are) loose somewhere in US, and somebody better do something about him(them) soon
8. Allah willed the air and sand atoms to rush together to create the book, just because