Ayuda please im not sure if this is the right answer

Flamethrower

Explanation:

These flamethrowers were good for close range combat, so they were perfect for trench warfare. They could brutally kill any enemy infantry, and were used to clear out buildings.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

the correct answer is d