Correct option is C
From the statement, B=D=F>S.
This means S < D, not greater.
Option A is false.
From the statement, R>G>A>B=D=F
This means F < R, not greater.
Option B is false.
From the statement, A>B=D=F
This means A > F.
Option C is true.
From the statement, R >G > A
This means A < R, not greater
Option D is false.