Which of these sentences would be most important to include in an objective summary of the article?
a vladimir lenin made peace with germany after he gained power in the bolshevik revolution.
b czar nicholas ii wanted to give power to his brother michael, but michael did not want the job of czar.
c in the early 1900s, russia went through two major revolutions that drastically changed its government.
d not only did many russians die in world war i, but the war effort also damaged the russian economy.