What was credit mobilizer?

a. a fake company set up for the friends of government officials
b. a fake company set up to add extra voters
c. a fake company set up by a railroad to make more money
d. a fake company set up to collect whiskey taxes

C. a fake company set up by a railroad to make more money.

Explanation:

Crédit Mobilier Scandal, in U.S. history, illegal manipulation of contracts by a construction and finance company associated with the building of the Union Pacific Railroad (1865–69); the incident established Crédit Mobilier of America as a symbol of post-Civil War corruption.

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it proved indian land claims were unjustified.