Answer:
Correct answer is They were all trading partners of the Soviet Union.
Step-by-step explanation:
First option is not correct as some of them, for example were far away from Soviet Union.
Second option is also not correct as most of them, except Soviet Union had no connections with the Oceans.
Third option is correct as they were all connected with Soviet Union. Trade links were the best way to do that.
Last option is not correct, as for example Hungary supported the Axis Power.