This question asks who can’t be fourth. If someone is fourth, they must have three people before them, and two people after them.
So, look for people who are either at the very start, or end of the diagram. That would be F and T.
A is CORRECT. F can’t go fourth. F has H, J and T after them, so F can go third at latest.
What about T? T could go fourth if both H and P went after T, like this:

T doesn’t need to be after H: there are no lines connecting T and H.

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