Answer:
Correct answer is 2. Loans from France, Spain, and The Netherland .
Explanation:
Option 1 is not correct, as Washington leadership was an important military factor, but not economic one.
Option 2 is correct as support of foreign countries, including the mentioned one was very important. Continental Army lacked provision, resources, weapons and many other things, therefore they needed this type of help.
Option 3 has nothing to do with the factors that decided the outcome of war.
Option 4 is also not correct as Cornwallis was a British general.