Which of the following lines creates a natural pause by using a comma correctly?
"I, uh, am confused. Weren't we leaving at noon?" asked Carla. ******
"Let's sit over, watch out!" yelled Bianca as the Frisbee passed over Nawal’s head.
"Thanks for packing my ham and cheese salad, ew, it's filled with sand!" shrieked Lara.
"I don't know what happened, suddenly the beach umbrella, was gone!" exclaimed Ned.