Which one is a periodic sentence （）？

A．The diver paused at the end of the board,gazing down at the smooth, greenish-bluewater meters below, his arms stretched out in front, his legs trembling slightly with anticipation and tension, drops of water falling from his fingertips into the swirling wind filled with murmurs from the crowd below and behind his solitary figur

E．

B．In opening minds, instilling values, and creating opportunities, education has no equal．

C．I have a dream that my four children will someday live in a nation where they will not be judged by the color of their skin but by the content of their character．