The number of turtles in a pond is four more than twice the number of crocodiles.  Which statement makes this comparison using the correct variable expression?     If there are c crocodiles, then there are 4c + 2 turtles.  If there are c crocodiles, then there are c + 2 + 4  turtles.  If there are c crocodiles, then there are 2c + 4 turtles.  If there are c crocodiles, then there are  c2+4  turtles.