In each example you will read a short sentence (or two). Then, a pronoun in the text is mentioned. Your task is to choose a referent which the mentioned pronoun refers to. You will be given two options in each case and one choice should seem much more likely to you than the other.
Q: sentence: the sink is clogged with grease . it has to be cleaned .pronoun: it. A) the sink B) the grease
A: 
the sink