Answer:
Roosevelt's big stick diplomacy is (C) a system of foreign policy that allowed the U.S. to intervene in Europe's wars
Explanation:
“Big Stick Diplomacy” refers to President “Theodore Roosevelt's” foreign policy which says, "speak softly and carry a 'big stick', you will go far”. He always wanted to show America's power around the globe.
In 1902, President of Venezuela, denied paying foreign debts and damages that were suffered by the European people in Venezuela war. But this issue was addressed in international court for negotiation and then Venezuela had to pay all the claims.
As a result, many other countries and even U.S was not able to take any action against this decision. U.S thought that this might favor Europe in future also. To prevent such interventions from Europe in future, this big stick policy was made.