When you “explode a moment,” you
a. identify people and places to provide additional details
b. add factual information to make your writing more accurate
c. expand a description by telling more about what happened
d. use dialogue to make the writing come alive

I believe the answer is: c.expand a description by telling more about what happened

This usually being done by adding some details to the story description to help the readers picturing the scene in their imagination. The purpose of this is to make the readers feel excited and able to understand the scene that the author wants to convey to them.

“The open window” by Saki

Explanation:

“The open window” is a story about a man with nervous problems, who stays in the house of her aunt for the sake of his health. In the house, he meets his younger cousin, Vera, who tells him that her mother always has the window of the room open because she is waiting for the return of her husband and son, who were lost in the forest and never came back. But they suddenly come, after three years and the man, thinking they are ghosts,  run away. The uncle is confused and Vera smile, because she didn’t want to share the room and told him a lie.

In contrast to The Thief and the Innkeeper where you know the thief wants to steal and you wait for the housekeeper to believe the lie, in The Open Window, you believe the ghost story until the end, because of the mystery of Vera and her family. The thief never changes, he is doing with a known purpose but Vera is strange and is not until the end when you knew her real intentions, the perspective we have of her as a character changes.