Select the odd one out from the following letter groups:

C. P, Q, R, S, T

If S is the grandmother of T and T is the son of U, what is U's relation to S?

B. SON

What is the result of dividing the polynomial 3x^3 + 6x^2 - 9x by 3x?

A. X^2 + 2X - 3

In a certain code, the word 'DOG' is coded as '47-15-7'. What is the code for the word 'CAT'?

A. 3-1-20

What is the code for the word 'FISH' if F=6, I=9, S=19, H=8?

A. 6198