What do you think was the most important reason that Communism appealed to the
Russian people? (easy to understand pls, i am really bad at history)

The most important reason is that the Communism meant the division of land, which until then was totally in the hands of rich Russian landowners.

Explanation:

Most people in Russia, especially peasants were poor. They had no belongings and had to work on the farms of Russian landowners. Communism offer them distribution of land and end of war, during which Russia suffered the most. That is why many people accepted to join the Red Army.

what are the options ?

i would say that the politicial parties from state to state varies.