Answer :
"A Great Mistake" contributes to the setting of the story, His hand dropped, and he gave vent to a cry of dismay. Thus, option "A" is correct.
What is a Falling Action in "A Great Mistake"?
A falling action or fall in a story or literature refers to that which happens very near the end of a story after the climax and resolution of the major conflict.
Most stories are usually written using this structure which is adapted from Freytag's Pyramid.
Learn more about Freytag's Pyramid in the link below:
brainly.com/question/7045131
#SPJ1