$24)$ To remove the first node in a nonempty linked list,

A$)$ set a reference pred to the predecessor of the node you want to remove, and set the successor of pred to

the successor of the head

B$)$ delete the node by setting the head reference to null:

head $=$ null;

C$)$ move the successor reference in the head node one node forward:

head.next $=$ head.next.next;

D$)$ move the head reference one node forward:

head $=$ head.next;