The type of one party system where there is no legal restrictions on other parties to exist is called ......... one party system.

Analyze the question: It asks for the type of one-party system where the law does not forbid other parties from existing, even though in practice only one party dominates.

Explain the concept: Political science uses two Latin terms here:

• De jure means "by law". A de jure one-party system is one where the constitution or law makes only one party legal and bans all others. Examples are Nigeria under General Abacha's transition arrangement (in practice) and the former Soviet Union and Ghana under Nkrumah after 1964.
• De facto means "in fact" or "in practice". A de facto one-party system is one where the law allows other parties, but in reality one party is so dominant (through popularity, control of resources, or electoral advantage) that no other party can win power.

The other options are not political terms in this sense:

• Deuce is a tennis score.
• "De qualle" is not a real term.
• Detour is a roundabout route.

Solution:

1. The question says there are no legal restrictions on other parties.
2. So the one-party status does not come from law, so it is not de jure.
3. It exists only in practice, because one party dominates, so it is de facto.

Answer: C.

Exam tip: Link "fact" to de facto (what actually happens) and "jure" to jurisprudence/justice (what the law says). If the law bans other parties, it is de jure. If the law permits them but one party dominates anyway, it is de facto.