Once you attempt the question then PrepInsta explanation will be displayed.
As the S1 is talking about the force exists in the universe, hence our subject is universe. Similarly now we have to pick the sentences which give required information about the same. Q follows it by information of its invention from the end of scientists than S explains about what is force of gravitation. P gives much more relevant information about it like what is it how does it works and where does it occurs. Further the Passage is continued by Statement R as it uses words like on or near which are the prepositions as the force is applicable on the surface of the earth. Ans it is concluded by S6 which explains the extend of gravitational force and its dependency.
So the correct passage is QSPR.
Final Passage - A force of exist between everybody in the universe. It has been investigated by many scientists including Galileo and Newton.. This gravitational force depends on the mass of the bodies involved. Normally it is very small but when the one of the bodies is a planet, like earth, the force is considerable. Everything on or near the surface of the earth is attracted by the mass of earth. The greater the mass, the greater is the earth's force of attraction on it. We can call this force of attraction gravity.