Complete the series: B, D, F, H, ?

A. J

If 'BAT' is coded as 'DWR', what is the code for 'CAT'?

B. DVR

  - Select the even number from the following options.

B. 4

If 'CAT' is coded as '3120', what is the code for 'DOG'?

B. 4156

Which pair of numbers is the odd one out?

C. 4, 6