The correct answer is D) As she walked vaguely up the steps she shifted the small pot from hand to hand; then she had to set in down and remove her mittens before she could open the heavy door.
The example from a "Visit Charity" that slows down the peacing of the history is "As she walked vaguely up the steps she shifted the small pot from hand to hand; then she had to set in down and remove her mittens before she could open the heavy door."
In this part of the story, the author changes the peace, which means it changes the speed of the way the story is told. What happens here is that the author slows the history down in order to make detailed descriptions of the scene and the character. So when the writer does this detailed description of things, he/she is changing the speed of the story. In this case, making it slow.