The main disadvantage of a traditional economy is it tends to discourage

they are affected by the physical environmental condition such as the  weather

Explanation:

Remember, a traditional economy is one in which the goods and services produced in the economy are often determined by the customs, traditions, or beliefs of the area. For example, if the custom of the people involves farming, then most people would be farmers in that location

The disadvantage of the traditional economy appears if, for example, there is limited rainfall, which means that many farmers will be affected negatively resulting in reduced or zero income.

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

answer; /// i believe that the correct answer is (b)///they gained vast amounts of