Choose the odd number pair from the following options.

B. (2, 4)

C is ranked 12th from the top and 9th from the bottom in a competition. How many participants are there in total?

C. 22

Which of the following groups of numbers is the odd one out?

D. (25, 50)

B, D, F, H, ?

A. J

In a race of 40 runners, D finishes 15th. If D swaps places with the runner who is 25th, what will be D's new rank?

A. 25TH