The correct answer is RQPS. Key Points R connects the given line as the verb told takes an object. here part P and part R both can be acted as an object but if we look further in sentence Q(to give an injection) then we can conclude that R is the first part of the sentence. Q further connects the sentence 'R' the nurse gives an injection to someone. Hence, 'Q' is the second part. P gives the answer to someone of sentence 'R' to whom the injection is being given. Hence, P is the third part. S is concluding the sentence. Hence, it is the last part. The correct sentence after rearranging the parts: The doctor told the nurse to give an injection to the patient after four hours. Hint Important Rules to Solve the Para Jumbles: Read the sentences attentively and try to comprehend the idea or theme of the sentence and eliminate the irrelevant options. Try to identify the opening( independent sentence) and closing sentences ( concluding sentence). Try to identify the mandatory pairs. Two sentences can be connected through various connectors and other determinants.