Step 1: Understanding the Concept:
Write or visualize the alphabet in reverse order: Z, Y, X, ... O, ... G, ... A. In a reversed series, "Right" means moving toward A, and "Left" means moving toward Z.
Step 2: Detailed Explanation:
In the original alphabet, O is the $15^{th}$ letter. In the reversed alphabet ($Z=1, A=26$), the position of O remains the same relative to its neighbors, but the directions swap.
Step 3: Calculation:
Starting at O in reverse order:
1st to right: N, 2nd: M, 3rd: L, 4th: K, 5th: J, 6th: I, 7th: H, 8th: G.
Step 4: Final Answer:
The eighth letter to the right of O is G. Thus, the correct option is (b).