Answer:
The best answer is actually letter A. The long, complex sentences slow down the pace and draw the action out.
Step-by-step explanation:
The speaker in the excerpt is describing what is probably the climax of the story. That is most likely the reason for him/her to use long sentences. They help elongate the action, making it more suspenseful. Instead of simply reading something short and quick, such as "I ran down the field and scored the goal", readers are taken through details that keep them on the edge of their seats. Will the speaker be stopped by the opponent team? Will he/she fall down to the ground? Will the speaker miss? They have to keep on reading, and still keep on reading to find out. There would be no suspense, otherwise.