The "social gospel" of late 19th century america held that

D) Christian principles should be applied to society's problem.

Explanation:

The followers of social Gospel movements were protestants who believed that the Second Coming wound not possible until humanity follows social ethical order. The movement developed in the late nineteenth century and concerned to eradicate social evils like child labor, economic inequality, alcoholism, etc.

1 a

2 c

3 c

4 b

5 a

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c, to compete