Question

russian revolution
which led to the 1905 revolution?
the events in st.
petersburg
the establishment of the
duma
the indifference of the tsar
the srike by millions of
workers

Explanation:

The 1905 Russian Revolution was triggered by the events in St. Petersburg (Bloody Sunday), where workers' peaceful protest was shot at, sparking widespread unrest. The Duma was established after the 1905 revolution, the tsar was not indifferent (he responded to unrest), and the worker strike was part of the St. Petersburg events. So the correct cause is the events in St. Petersburg.

Answer:

the events in St. Petersburg