Given below are six sentences of a passage. The first and sixth sentences are given in the beginning as SI and S6. The middle four-sentence in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences. S1: The Nobel Prize for Economics in 2018 was awarded to Paul Romer and William Nordhaus for their work in two separate areas: economic growth and environmental economics respectively.
S6: Among recent winners of Nobel Prize in Economics, it's hard to think of one issue which is more topical and relevant to India.
P : But there is a common thread in their work.
Q : In economic jargon it's termed as externality.
R : Productive activity often has spillovers, meaning that it can impact an unrelated party.
S: Romer and Nordhaus both studied the impact of externalities and came up with profound insights and economic models.
The correct sequence should be

Options

A. PQRS
B. PRQS
C. QSPR
D. QSRP