Francie was on the computer. She was allowed to play her games after she finished her homework. Francie liked playing on the computer. It was really fun. When her friends were over, they would play games together.
Today, Francie was playing by herself. She had music playing in the background, and her mother was out getting groceries. It was pretty quiet in the house. Francie had just gotten to the next level in Sky Mania, an airplane game, when the screen suddenly went black.
What happened? She was just playing her game. She didn't press anything she wasn't supposed to or pull on any of the cords. Francie started to get nervous. She was afraid she broke the computer. Her mom would be so mad!

Which line shows an idea that would be good to include in a summary of this story?
A.
. . . when the screen suddenly went black.
B.
Today, Francie was playing by herself.
C.
It was really fun.
D.
She was just playing her game.