Which statement best describes the credit mobilier scandal?

1.grant's vice president was involved in a scheme in which railroad insiders hired themselves to build railroads at inflated prices.

2.grant's secretary of war took bribes to sell indian trading posts.

3.chester arthur made efforts to avoid patronage when he became acting president after president garfield was assassinated.

4.two speculators artificially inflated the price of gold, bribing grant's brother-in-law to keep the us treasury from releasing gold.