An electric bus has onboard instruments that report the total electricity consumed since the start of the trip as well as the total distance covered. During a single day of operation, the bus travels on stretches M, N, O and P, in that order. The cumulative distances traveled and the corresponding electricity consumption are shown in the Table below

The stretch where the electricity consumption per km is minimum is 

(A) M 

(B) N 

(C) O 

(D) P

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