Which situation resulted from the russo-japanese war of 1905?

When the Russian lost the war, dissident groups started to question the power and authority of the Russian Czar, which resulted in the Russian Revolution. The Russo-Japanese War was seen more as the downfall of a western power, rather than the rise of an Eastern power. With that, the internal conflict and turmoil in Russia forced the country to become communists.

Ithink the answer should be a.