Russia lost power in the 1900s due to

a. unrest among the poor
b. Catherine I's cruelty
c. the rise of Romanovs
d. religious conflict

The correct answer is a. unrest among the poor.

In the early 1900s, Russia experienced significant social and economic issues that led to widespread discontent among the lower classes. These grievances, including poor working conditions, low wages, and food shortages, fueled widespread strikes and demonstrations. The discontent eventually culminated in the Russian Revolution of 1917, which resulted in the overthrow of the Russian monarchy and the establishment of the Soviet Union.