Explanation:

Correct answer is (a). Connector I It is not correct since the cause is the viral fever and declaration of holidays is the effect of the same. This is irrelevant in the given context.Connector II Though the declaration of holidays is the effect, in this sentence it has been used to denote the reason. It is just opposite of the meaning that should be implied by the given statements. The cause should be there first and then the effect and not the other way around.Connector III This correctly establishes the cause-effect relationship between the given statements as, “Since all the students in the hostel are suffering from viral fever, the school has declared holidays for one more month.”Hence, option A is the correct choice.