Answer:
c) because the Vietnam war was fought in an especially brutal and untraditional way
Step-by-step explanation:
In the excerpt from "A Rumor of War," the author Philip Caputo makes reference to the brutality of the Vietnam War, in which he fought, and the difficulties for the soldiers to go through an unprecedented and unusual armed conflict. In that respect, he mentions attacks by surprise and battles with guns instead of using other kinds of armament.