Which of the following headlines is MOST LIKELY an example of clickbait?

“DOCTORS SWITCH TWINS AT BIRTH…YOU WON’T BELIEVE WHAT HAPPENED NEXT!”

“YOUNG CHESS PLAYER SERVES UP SUPERB STRATEGY”

“AIR POLLUTION NOW LEADING CAUSE OF LUNG CANCER"

“STUDENT SWALLOWS CHEW TOY AS REVENGE FOR DOG EATING HOMEWORK”