Answer:
Lenin died on 21 January 1924. Stalin was given the honour of organizing his funeral. Upon Lenin's death, Stalin was officially hailed as his successor as the leader of the ruling Communist Party and of the Soviet Union itself.
Explanation:
There was no PRESIDENT of the central government, and this no separation of power at the FEDERAL (central) level.<span />
"His role as a military commander during World War I" is the one among the following factors given in the question that helped him gain such a following before he became <span>president. The correct option among all the options that are given in the question is the second option.</span>