Requested Page references are $3, 8, 2, 3, 9, 1, 6, 3, 8, 9, 3, 6, 2, 1, 3$ and number of page frames is $ 5$.
In FIFO Page replacement will take place in sequence in pattern First In first Out, as following$$\small \begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline \textbf{Request} & \textbf{3} & \textbf{8} & \textbf{2} & \textbf{3} & \textbf{9} & \textbf{1} & \textbf{6} & \textbf{3} & \textbf{8} & \textbf{9} & \textbf{3} & \textbf{6} & \textbf{2} & \textbf{1} & \textbf{3} \\\hline \textbf{Frame 5} & \text{} & \text{} & \text{} & \text{} & \text{} & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 \\\hline \textbf{Frame 4} & \text{} & \text{} & \text{} & \text{} & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 2 & 2 & 2\\\hline \textbf{Frame 3} & \text{} & \text{} & 2 & 2 & 2 & 2 & 2 & 2 & 8 & 8 & 8 & 8 & 8 & 8 & 8 \\\hline \textbf{Frame 2} & \text{} & 8 & 8 & 8 & 8 & 8 & 8 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 \\\hline \textbf{Frame 1} & 3 & 3 & 3 & 3 & 3 & 3 & 6 & 6 & 6 & 6 & 6 & 6 & 6 & 6 & 6 \\\hline \textbf{Miss/hit} & \text{F} & \text{F} & \text{F} & \text{H} & \text{F} & \text{F}&\text{F}& \text{F}& \text{F} & \text{H}& \text{H}& \text{H} & \text{F} & \text{H} & \text{H} \\\hline \end{array}$$Number of Faults $= 9.$ Number of Hits $= 6$
Using Least Recently Used (LRU) page replacement will be the page which is visited least recently (which is not used for the longest time), as following:$$\small \begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline \textbf{Request} & \textbf{3} & \textbf{8} & \textbf{2} & \textbf{3} & \textbf{9} & \textbf{1} & \textbf{6} & \textbf{3} & \textbf{8} & \textbf{9} & \textbf{3} & \textbf{6} & \textbf{2} & \textbf{1} & \textbf{3} \\\hline \textbf{Frame 5} & \text{} & \text{} & \text{} & \text{} & \text{} & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 2 & 2 & 2 \\\hline \textbf{Frame 4} & \text{} & \text{} & \text{} & \text{} & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 9 & 9 \\\hline \textbf{Frame 3} & \text{} & \text{} & 2 & 2 & 2 & 2 & 2 & 2 & 8 & 8 & 8 & 8 & 8 & 1 & 1 \\\hline \textbf{Frame 2} & \text{} & 8 & 8 & 8 & 8 & 8 & 6 & 6 & 6 & 6 & 6 & 6 & 6 & 6 & 6 \\\hline \textbf{Frame 1} & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 & 3 \\\hline \textbf{Miss/hit} & \text{F} & \text{F} & \text{F} & \text{H} & \text{F} & \text{F}&\text{F}& \text{H}& \text{F} & \text{H}& \text{H}& \text{H} & \text{F} & \text{F} & \text{H} \\\hline \end{array}$$Number of Faults $= 9.$ Number of Hits $= 6$
So, both incur the same number of page faults.
Correct Answer: $A$