The correct option is C Relative pronoun- which, Antecedent - the tiger
A relative pronoun functions as a pronoun as well as a conjunction. As a pronoun, it refers or relates to a noun that's common between two sentences, and as a conjunction it combines those sentences. The noun which the relative pronoun refers to, is called its 'antecedent'. Usually the subject is the antecedent. The pronoun should be as close to its antecedent as possible, following immediately after it. In the given sentence, the subject is "The tiger', a word is required to relate it to the rest of the sentence. Hence, "the tiger" is the antecedent. The most suitable pronoun from the given options is 'which', it refers to the tiger, 'which' is usually used for things and animals, hence option C is correct. Option A has the opposite answers, they're not correct because the tiger is not the relative pronoun, which 'follows' the antecedent, not vice versa, hence option A is incorrect. "The tiger" is an antecedent, "no antecedent" is the case where the statement is a general truth, and the antecedent is implied through that statement and can be omitted. For example, '(He) who works hard gets rewarded'. The given statement is not a general truth, making option B incorrect. "Gave out a loud roar" is an action carried out by the tiger, there's no object here, as it's not mentioned toward what or whom did the tiger roar. It's not the pronoun, hence option D is incorrect.