Correct option is D

We are given the words: ROW, MAD, LAY, CAT
Step 1: Change each letter to the next letter in the English alphabetical order.
For each word, apply this transformation:
ROW
R→S, O→P, W→ X
New word: SPX
MAD
M→N, A→B, D→ E
New word: NBE
LAY
L→M, A→B, Y→ Z
New word: MBZ
CAT
C→D, A→B, T→ U
New word: DBU
The vowels in English are: A, E, I, O, U.
SPX: No vowels → Valid
NBE: Contains E → Not valid
MBZ: No vowels → Valid
DBU: Contains U → Not valid
The words without vowels are SPX and MBZ. Thus, there are 2 such words.
Thus, correct option is (d).