Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?

• A. ηma × ηm × ηv = ηo
• B. ηm = ηv . ηma
• C. ηm = ηv . ηma
• D. ηv = ηm × ηma