Name the country which is the single largest contributor to the UN budget?

USA

The correct answer is option (3) - USA

Within the UN, the influence of the US is considerable. As the single largest contributor to the UN, the US has unmatched financial power. The fact that the UN is physically located within the US territory gives Washington additional sources of influence. The US also has many nationals in the UN bureaucracy. In addition, with its veto power the US can stop any moves that it finds annoying or damaging to its interests or the interests of its friends and allies. The power of the US and its veto within the organisation also ensure that Washington has a considerable degree of say in the choice of the Secretary General of the UN. The US can and does use this power to “split” the rest of the world and to reduce opposition to its policies.