S1 : A force exists between everybody in the univeres.
S6: The greater the mass, the greater is the Earth's force of attraction on it. We can call this force of attraction as gravity.
P : Normally, it is very small but when the one of the bodies is a planet like Earth, the force is considerable.
Q : It has been investigated by many scientists including Galileo and Newton.
R : Everything on or near the surface of the Earth is attracted by the mass of Earth.
S : this gravitational force depends on the mass of the bodies involved.
The proper sequuence should be

Options

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

Answer

D