(Scroll down for diagrams + explanation)
The first step should always be to draw the diagram, as above. R can’t go fourth or seventh, because of rule 2. It would be too close to F.
That means R goes second or third.
S is who we’re interested in. The only open spots are 2, 3, 4 and 7.
S can’t go second, because it would be beside O. S also can’t go third. Why?
If S went third, P goes second. (rule 5)
The only spaces left for R would be fourth or seventh. That doesn’t work, because of rule 2.
Here’s my inelegant drawing of this (non)possibility:
So S can’t go second or third, and A is CORRECT. S goes fourth or seventh.
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