Directions: The question has a set of four sentences. Each sentence has a pair of words/phrases that are italicised and highlighted. Select the most appropriate word or phrase to form grammatically and syntactically correct sentences. Then, from the options given, choose the best one.

The factory affluent A/effluent B ought to be treated before discharge. Sometimes the police elicits A/extorts B the information under duress. He maintains his calm and equability A/equitability B under all circumstances. The circumstances are exiguous A/exigent B and demanding.