"I suppose I resembled a kind of fish with my mouth open gasping for air. It seemed as if my lungs were gradually shutting down and my heart pounded away in my ears like the beat of a drum. . . . To get air into my lungs was real agony." —William Pressey, quoted in People at War 1914-1918
The weapon described in this passage was primarily used


A. in trench warfare.
B. in zeppelin attacks on civilian targets.
C. by airplanes in dogfights.
D. by terrorist groups such as the Black Hand.