The writer used the word "so" in sentence 26 to: A: Give an example
B: Repeat an idea
C. Tell a main idea
D. Sound a warning

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long  

answer; (b); the abolitionist movement;

there is no passage.