In 1993, Nigerian troops were on peace-keeping assignment to

Analyze the question: The question asks which countries Nigerian troops were sent to on peacekeeping duty in 1993.

Concept: Nigeria has been a major contributor to peacekeeping in Africa and beyond. Key missions to know:

• Chad (1981-82): an OAU force, but this was before 1993.
• Liberia (1990 onward): ECOMOG, led by Nigeria under ECOWAS.
• Somalia (1992-1994): Nigerian troops joined UNOSOM (the UN Operation in Somalia). In 1993 Nigerian soldiers were part of the UN force there.
• Rwanda (1993-96): Nigerian troops took part in UNAMIR, but this began in late 1993 and was mostly associated with 1994.
• Burundi: Nigeria's involvement came much later (2000s, AMIB).

Step-by-step elimination:

• A. Liberia and Burundi: Burundi involvement came later, so this is wrong.
• B. Rwanda and Liberia: Rwanda is plausible only for UNAMIR from late 1993/1994, and it is not the standard answer for 1993.
• C. Chad and Liberia: Chad was in 1981-82, so this is wrong for 1993.
• D. Liberia and Somalia: Liberia (ECOMOG) was ongoing, and Nigerian troops served in Somalia with the UN in 1993. This fits best.

Answer: The best answer is **D.

Exam tip: Link the dates to the missions: Chad is 1981-82, Liberia is 1990 onward, Somalia is 1992-94, and Rwanda is 1994. When a question gives a year, eliminate the options with countries from other periods.