Nigeria participated in UN peace-keeping operations in

Analyze the question: The question asks which set of countries Nigeria has served in on UN peace-keeping missions. To answer it, check each option against what you know of Nigeria's record.

Concept: Nigeria has been one of the biggest contributors of troops and police to UN peace-keeping since 1960. Some well-known missions:

• Congo (1960-64): ONUC, Nigeria's first major peace-keeping mission
• Lebanon (1978-83): UNIFIL
• Chad (1981-82): an OAU mission
• Namibia (1989-90): UNTAG
• Cambodia (1992-93): UNTAC
• Liberia, Sierra Leone (ECOMOG, a regional force), Somalia, Rwanda, Bosnia, Darfur (Sudan), Mali and others

Step-by-step check:

• A. Cambodia, Lebanon and Namibia: Nigeria took part in UNTAC in Cambodia, UNIFIL in Lebanon and UNTAG in Namibia. All three are correct.
• B. Lebanon, Congo and Kuwait: Lebanon and Congo are correct, but Nigeria had no UN peace-keeping mission in Kuwait. Wrong.
• C. Congo, Cambodia and Zimbabwe: Congo and Cambodia are correct, but Zimbabwe was not a UN peace-keeping mission for Nigeria. Wrong.
• D. Namibia, Cambodia and Kuwait: Kuwait again makes this option wrong.

Only option A has all three countries right.

Answer: A. Cambodia, Lebanon and Namibia

Exam tip: In "which of the following" questions with three items per option, find one country you know is wrong (here, Kuwait or Zimbabwe) and eliminate every option containing it. Kuwait removes B and D, Zimbabwe removes C, and A is left. Remember the sequence Congo → Lebanon → Namibia → Cambodia (1960s to 1990s) to recall the main missions quickly.