Choose or find odd letter group - BCD , NPR , KLM , RQP , HGF

B. NPR

Choose or find odd word - Ballot , Manifesto , Election , Vote

C. ELECTION

Choose or find odd pair of words - (Ammeter : Current) , (Hygrometer : Pressure) , (Odometer : Speed) , (Seismograph : Earthquakes)

B. HYGROMETER : PRESSURE

Choose or find odd letter group - CZHK, MLAG, XUBU, SENO, YDFP

C. XUBU

Choose or find odd number - 49 , 63 , 77 , 81

D. 81