Questions

The Summit at Sanya will mark the admission of South Africa to the group, which will extend the geographic representation of the mechanism in a moment when the financial system reform is sought worldwide, as well as agreater democratization of global governance in general.On 14 April 2011, 3rd BRICS (Brazil, Russia, China and South Africa) Summit is to be held in the Chinese city of Sanya, alongside the President of China, Hu Jintao, the President of Russia, Dmitri Medvedev, the Prime Minister of India, Manmohan Singh, and the President of South Africa, Jacob Zuma. The previous Summits were held in Yekaterinburg (June 2009) and Brasília (April 2010)

The meanings of the given words are as follows:
Tremulous: shaking or quivering slightly 

Stringent: (of regulations, requirements, or conditions) strict, precise, and exacting

Garrulous: excessively talkative, especially on trivial matters
Quivery: shaking or trembling slightly
Steady: firmly fixed, supported, or balanced; not shaking or moving
Conjunctive: relating to or forming a connection or combination of things
Desist: stop doing something; cease or abstain

Abstain: restrain oneself from doing or enjoying something
Defer: put off (an action or event) to a later time; postpone
Terse: sparing in the use of words; abrupt
Abrupt: sudden and unexpected
Therefore, it can be observed that option B i.e. ‘quivery, steady’ forms a synonym-antonym pair of ‘tremulous’.