Answer:
c.quickly and effectively.
Explanation:
The most infamous and effective gas of the First World War was mustard gas, a vesicant introduced by the Germans in July 1917 before the Third Battle of Ypres. Known to the British as HS (or Hun Stuff), mustard gas was not intended to be a lethal agent (although it was in high doses), but was designed to harass and incapacitate the enemy and contaminate the battlefield. It fired inside artillery shells, and was heavier than air. It perched on the ground in the form of a liquid similar to sherry, and evaporated slowly without sunlight.
The polluting nature of the mustard gas meant that it was not always adequate to support an attack, since the assault infantry would be exposed to the gas during its advance. When Germany launched Operation Michael on March 21, 1918, they saturated the outgoing Flesquières with mustard gas instead of attacking it directly, believing that the harassing effect of gas coupled with threats to the flanks of the salient, would cause the British position was unsustainable.
The gas was never as successful as it was on April 22, 1915; however, it became a standard weapon that, combined with conventional artillery, was used to support most attacks in the final phases of the war. The Western Front was the main scenario in which the gas was used - the static and confined trenches system was ideal for achieving effective concentration. However, Germany used gas against Russia on the Eastern Front, where the lack of effective countermeasures would result in the death of thousands of Russian soldiers; For its part, the British experimented with gas in Palestine during the Second Battle of Gaza.
