Choose or find odd number pair - (3 - 4) , (4 - 7) , (5 - 12) , (20 - 21)

D. 20 - 21

Choose or find odd word - Fear , Anger , Sober , Love

C. SOBER

Choose or find odd word - Ruby , Sapphire , Granite , Topaz

C. GRANITE

Choose or find odd word - Mandible , Rib , Sternum , Ulna , Pinna

E. PINNA

Number of the letters skipped in between adjacent letters in the series is two.
Which one of the following alternatives observes this rule ?

C. UROLIF