How was Rockefeller able to build his monopoly across the oil industry? O He found newer and cheaper ways to refine oil, increasing his profits.
O He cohfined his business to Ohio so he could buy al the refineries there.
O He bought up oil refineries, cut costs, and reinvested his profits in other refineries.
O He began to sell kerosene as well as oil, expanding his market.

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

the percentage of students at the school need special diets is

c) 10 percent