A is wrong because you always need to interview Fu.
B is wrong. If you interview J then you have to interview L.
C is wrong. If you inteview G then you interview J and L, which is two more.
D is wrong. If you interview G then you have to interview J and L. That makes three total. But you also have to interview Fu, which is four total.
E is CORRECT. We could have G, J and L interviewed, along with Fu.

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