Sumner was physically attacked by brooks in congress because .
a. sumner had attacked abolitionists in congress.
c. sumner had berated pro-slavery, popular sovereignty supporters.
b. sumner supported the border ruffians in the kansas territory.
d. sumner challenged the fugitive slave act and angered pro-slavery supporters.

Sumner was physically attacked by Brooks in Congress because "d. Sumner challenged the Fugitive Slave Act and angered pro-slavery supporters" since he was an avid abolitionist. 

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