The problems of squaring a pan -European agenda with the national interests of 25 separate countries--------the process of integration a slow ,complex and at times divisive one.

A causes

B often affect

C have made

D resulting in

Correct Answer: Option C

শূন্যস্থানে একটি finite verb এবং অবশ্যই plural verb লাগবে।কারন এ বাক্যে কোনো finite verb নেই এবং এর subject plural (problems)