The main purpose of the system is : B. it keeps one person or group in government from having too much power
Before magna Charta, Kings were untouchable by Law and can do whatever they like because the system allowed them to have measurable power within their kingdom.
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In the West, the Vicksburg campaign, where Grant captured the last Confederate stronghold on the Mississippi, dividing the Confederacy into two parts, and enabling him to rescue the besieged Army of the Cumberland at Chattanooga. (This ended the war in the West).
The IRS so the answer is B
Both were black nationalist groups but the difference is that the Black Panther Party (BPP) were a more right-winged extremist group compared to the National Urban League (NUL) when it came to the two political/social activist parties. Basically the BPP were willing to break the law to achieve their demands, while the NUL did it via the system with more progressive tactics. Or, less violent at the least.