The correct answer is option 1 i.e. QRSP Sentence re-arrangement is done by grammatically and logically understanding the meaning. The available options have either P or Q as the first sentence. Let's see how to approach. If we start our sentence with P, then we are missing an article 'the'. 'The' is used when we refer to a noun, which is one of a kind. If we were to start the sentence by P then it should have been The Prime Minister of India. Let's look at starting the sentence with Q. Indira Gandhi is the noun here. Indira Gandhi {noun} should be followed by a pronoun in the follow-up sentence, meaning subpart S ( pronoun- woman) should come next. But, in subpart S the condition is unfulfilled, ____and only woman To fill in the blanks we need another condition, so subpart R is the only logical condition here "the first and only woman". Thus, the correct arrangement is- QRSP Correct sentence -Indira Gandhi was the first and only woman Prime Minister of India.