Choose the weapon that fits each description. 1. The use of poison gasy caused more than 1.3 million casualties.

2. World War I trenches were easily defended through the use of machine gunsy

3. Though not particularly effective during World War I, tanks
made trench warfare obsolete.

these acts divided the south into five military districts.

i think it's b

dylan has written many enduring songs and he has received several awards for his musical achievement;  

any written work with artistic value can be considered literature; especially if such work is publicly recognized, and has had importance and endurance among people; whether is poetry or fiction or drama or even criticism, since it's the transcendence and representation of a culture, language or people in a period of time to more people, using letters (words), regardless the subject.

the nobel prize in literature is given to authors from any country based on a body of work as a whole that inspires and nurses the life of humanity.  

and the work of bob dylan matches that description, therefore is well deserved since he'd created new poetic expressions within the american song tradition, that has inspired and influenced the lives of many people, not only withing the united stated but worldwide as well.