The Spartacist League was a political party that opposed the Weimer Republic in Germany. They were in favour of a Soviet-style governance. However, they could not achieve the success as they were opposed by the Socialists, Democrats, Catholics and  severely crushed by the Free Corps. 

Option A is not a result of Spartacist league...It was what done to crush the uprising.

The most important result of the Spartacus League uprising in Germany in 1918-19 was that both the Weimar Republic crushed the rebellion and the Spartacists founded the Communist Party of Germany. Let's break down the reasons behind this answer:

1. The Weimar Republic crushed the rebellion:
The Spartacus League uprising, also known as the Spartacist uprising, was a left-wing revolutionary movement led by Karl Liebknecht and Rosa Luxemburg. The Spartacists aimed to overthrow the newly formed Weimar Republic, which was seen by many left-wing groups as a continuation of the old authoritarian regime. However, the Weimar Republic was determined to establish its authority and maintain stability in the country.

- The uprising began on January 5, 1919, with the occupation of key buildings in Berlin by the Spartacists. However, the Weimar government, supported by the moderate socialist forces, mobilized the Freikorps, a paramilitary organization composed of demobilized soldiers, to suppress the rebellion.
- The Weimar Republic, with the assistance of the Freikorps, launched a counteroffensive against the Spartacists. After several days of intense fighting, the rebellion was brutally crushed. Thousands of rebels were killed or arrested, including Liebknecht and Luxemburg, who were later executed without trial.

2. The Spartacists founded the Communist Party of Germany:
Despite the failure of the uprising, the Spartacus League continued to advocate for their revolutionary ideals. They saw the need to regroup and organize a political party that would champion the interests of the working class. As a result, the Spartacists founded the Communist Party of Germany (KPD) in December 1918.

- The KPD aimed to establish a socialist state in Germany through a proletarian revolution. They rejected the moderate socialist approach of the Social Democratic Party (SPD) and sought to mobilize the working class against the bourgeoisie.
- The KPD played a significant role in German politics during the Weimar era. Although they faced constant persecution and suppression by the Weimar government, they remained a vocal opposition party and sought to build a mass movement to challenge the capitalist system.

In conclusion, the most important result of the Spartacus League uprising was the simultaneous crushing of the rebellion by the Weimar Republic and the founding of the Communist Party of Germany by the Spartacists. This event marked a significant moment in German history, highlighting the intense political and ideological struggles that characterized the early years of the Weimar Republic.