Which of the Following Examples Best Illustrates Necessity

Which of the following examples best illustrates necessity?

A) Rich sees a fire in a pharmacy after closing hours. He breaks open the door and puts out the fire with the extinguisher he carries in his truck.
B) Gretchen spots a cat caught in a tree. Running across the street to a library, she telephones the fire department.
C) While watching a wrestling match, the fan sitting next to Natalia shouts expletives. Natalia hits him in the side to shut him up.
D) While walking to class, Ushi spots a piece of jewelry lying on the sidewalk. She takes it to the police station.