The game requires us to determine the order of 7 meetings with 5 dignitaries - F M R S T - 3 of which are with F - F F F M R S T. F meetings are nonconsecutive. The question asks us if R is right after S - T S R, then which of the following must be true?
Let's think for a second where could T S R block fit in the schedule. Since we cannot have two F meetings in a row, T S R cannot be at the end or the beginning of the schedule:
T S R F X F F <- impossible
This leaves only the following options open::
F T S R F M F F M F T S R F
Let's look at (B) and (E).
(B) G 4th meeting is with R.
This is true in scenario 1, but in scenario 2, meeting with R could be #6. Hence, (B) could be rather than MUST BE TRUE.
(E) G 7th meeting is with F.
Both scenarios demonstrate that the schedule must begin and end with F, therefore, (E) must be true.
Let me know if this makes sense and if you have any further questions.