Which factor made it easy for communism to spread in Eastern Europe?

The Eastern European economies were damaged and under Soviet military control, resulting in them not gaining relief from the US, allowing communism to spread, as it had already taken over the Soviet Union.

Explanation:

temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation:

a and b because with the other three, they simplify to something else.