Let's analyze the relationship between the first pair of letters "TUV" and "VYB":
- From T → V: The letter T is shifted forward by 2 positions to become V.
- From U → Y: The letter U is shifted forward by 4 positions to become Y.
- From V → B: The letter V is shifted forward by 6 positions to become B.
Now, we apply the same pattern of shifts to the letters in "PRA":
- From P → R: The letter P is shifted forward by 2 positions to become R.
- From R → V: The letter R is shifted forward by 4 positions to become V.
- From A → G: The letter A is shifted forward by 6 positions to become G.
Thus, the letters corresponding to PRA would be "RVG". Therefore, the correct answer is (B).