Question group 73 to 75 : Consider the following code of a singly linked list, with the function F to "rotate" the list by moving the first item of the list to the end of the list. The input to the function is the address of pfirst, the pointer to the first item in the list. You need to select the correct expressions to put into the code in the following three questions so that the function works correctly.
  

【題組】73. What expression should be in "AAA"?
(A) x
(B) x-＞next
(C) y-＞next
(D) first
(E) x-＞next-＞next