Choose the most logical order of sentences from among the given choices to construct a coherent paragraph:(a) An integrated and combined approach was required to reveal the mystery of the brain —its structure, composition and function. (b) Since the early 80's, scientists were clear that the brain would be the final frontier to conquer. (c) The initiative was flagged off and came to be known as the Human Brain Project. (d) But that wasn't easy because understanding the brain involved completely integrating information from the level of the gene to the level of behaviour. (e) To fulfill this requirement a group of American scientists from various disciplines decided to work together.

Different words form a sentence and convey their meaning only when arranged in a proper order. A Paragraph is formed from sentences, it will convey its true meaning and purpose only when the sentences are arranged in a proper manner.    
In the following questions, some parts of the sentence have been jumbled up. You are required to rearrange these parts which are labelled P, Q, R and S to produce the correct sentence.