The answer is E. XYZA.
In each of the other options, the letters are in alphabetical order, but in reverse. For example, in A. PXZD, the letters are in reverse alphabetical order from Z to A. In B. QSBR, the letters are in reverse alphabetical order from R to B. In C. RAEG, the letters are in reverse alphabetical order from G to A. In D. SUVW, the letters are in reverse alphabetical order from W to U. However, in E. XYZA, the letters are not in reverse alphabetical order.
Here is a table showing the letters in each option in alphabetical order, and the order in which they appear in the option:
| Option | Letters in alphabetical order | Order in option |
|—|—|—|
| A. PXZD | P, X, Z, D | Z, D, X, P |
| B. QSBR | Q, S, B, R | R, B, S, Q |
| C. RAEG | R, A, E, G | G, E, A, R |
| D. SUVW | S, U, V, W | W, V, U, S |
| E. XYZA | X, Y, Z, A | A, Z, Y, X |
As you can see, the only option where the letters are not in reverse alphabetical order is E. XYZA. Therefore, E is the odd one out.