Will fan and suppose spain produces only cars and trucks. the resources that are used in the production of these two goods are not specialized—that is, the same set of resources is equally useful in producing both trucks and cars. the shape of spain’s production possibilities frontier (ppf) should reflect the fact that as spain produces more trucks and fewer cars, the opportunity cost of producing each additional truck: a. increases b. decreases c. remains constant

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 answer is   b. coronado.