One major problem that threatens Nigeria as a federation is over the adoption of an acceptable formula for

Analyze the question: It asks about a major problem threatening Nigeria's federation, specifically the lack of an acceptable formula for something. In Nigerian government studies, a "formula" points to the sharing of resources among the tiers and units of government.

Concept: In a federation, powers and resources are shared between the federal, state, and local governments. In Nigeria, the main money pool is the Federation Account, which is mostly funded by oil revenue. The question is how to share it among the three tiers of government (vertical allocation) and among the states and local governments (horizontal allocation).

Step-by-step reasoning:

1. Electioneering (A): This concerns the conduct of elections, not a "formula."
2. Post sharing (B): Appointments are handled through the Federal Character principle, which is a different issue.
3. Raising fund (C) and revenue generation (D): These concern how money is collected, and they are not the major source of disputes.
4. Revenue sharing (E): Nigeria has had many commissions, such as Phillipson, Hicks-Phillipson, Raisman, Binns, Aboyade, Okigbo, and the Revenue Mobilisation Allocation and Fiscal Commission (RMAFC). They were set up to find an acceptable formula. Disputes continue over the criteria (population, equality of states, derivation, landmass, internal revenue effort), and they have caused agitation, particularly over the derivation principle in the Niger Delta.

Correct answer: E. revenue sharing

Tip: In Nigerian Government questions, the words "formula" or "allocation" almost always point to revenue allocation. Remember the main criteria: derivation, population, equality of states, need, and landmass.