5, 4, 3, 2, 1, 4, 3, 5, 4, 3, 4, 1, 4 page frame are 3 and page 5 is already there so no page fault for 5
now execution starts 4 and 3 will come in with page fault no 1 and 2
acc to FIFO page 2 ,1 will replace 5 and 4 and cause page fault no 3 and 4 and so on
9 w.r.to FIFO is only in choice D so it will be the ans