Answer: D looks to be the right answer, sorry if I'm wrong!
<span>George Santayana is the answer my friend.</span>
A summit is a meeting of heads of state or government. They started as a way for leaders to share their problems directly without all the fuss of a big conference room or press. They usually have high security as well.
I don't know much but all I know is that it was a established in the 16th century and it is moderen day Canada. How it helps!