Answer:
Correct answer is C. prevent future conflict on the continent.
Step-by-step explanation:
C is correct because roots of EU can be traced back to the period after WW2 when Germany and France decided to create a Union which will prevent conflicts between European countries.
Through time this Union developed and as we can see almost 30 countries today are members of EU.
Therefore this is correct answer, as other options are not the main reason for the creation of EU.