Which most likely explains why some countries lack opposition parties? They lack popular support.
They destroy the election process.
They oppose the interests of the people.
They are prohibited by law.

They are prohibited by law

Explanation:

The opposition party in a particular country are the parties that are against the present government. It should be noted that some countries lack opposition parties because they're not allowed by law.

This can be seen with countries that practice autocracy whereby there's one person that typically has the power. In this case, other opposition parties may be prohibited by law.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.