The line "Overnight, people's image of sharks was transformed" shows how people had doubts about the occurrence of shark attacks, as shown in option D.
Sharks have a very strong jaw and sharp teeth that can create big wounds on swimmers. However, many people doubt the shark's destructive power and have doubts about the possibility of attacks.
An example of this is seen in the line presented in option D, where people saw sharks as harmless, but when they witnessed an attack, they completely changed the way they saw them.
More information about sharks is at the link:
https://brainly.com/question/14955486