You’ve read on the notice board of your university that your friend, Nicholas, has won the honor of "Best Delegate" in National Model United Nations Conference 2014. Write a note of congratulations to him.

A．The participants were asked to chat for at least five minutes.
B．Contact information was exchanged among the students.
C．The students had to fix their suitors before brain scanning.
D．Pictures of the participants were presented before they met.