The correct answers are A) the persecution of minority groups and C) the promotion of the traditional Russian culture.
The two effects of nationalism in 19th century Russia were the persecution of minority groups and the promotion of the traditional Russian culture.
Russian Emperor Nicolas 1 instituted the Imperial Russian Nationalism as the official ideology in Russia under the phrase "Orthodoxy, Autocracy, and Nationality." This nationalism tried to eliminate Western European influences of the past and promote the culture and values of Russia. With this, Emperor Nicolas 1 protected the Orthodox Church, demanded total loyalty to the Russian Empire, and promoted the values and history of Russia.
The other options of the question were b) the celebration of German-speaking residents, d) an increase in industrial development and e) the adoption of liberal policies.