Which of the following quotations demonstrates the through-line of the narrative arc in chapters 2 and 3 of the call of the wild? "'

one devil, dat spitz,' remarked perrault. 'some dam day heem keel dat buck.'"

"there was imperative need to be constantly alert; for these dogs and men were not town dogs and men."

"she announced her condition by a long, heart-breaking howl that sent every dog bristling with fear, then sprang straight for buck."

"and not only did he learn by experience, but instincts long dead became alive again."