When Theodore Roosevelt became head of the Civil Service Commission, he lobbied Congress and made significant changes to the system. (Select all that apply.) He developed a job classification system. He created a jobs survey for federal workers. He established conditions laid out in rules for the firing of staff. He reduced the budget of the Commission in an effort to reduce spoils

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question

anybody wanna play fortnite?

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

they became hereditary because there weren't many jobs for people in lower classes