Correct Answer - Option 2 : 1.75 kW

__Concept:__

\(COP = \frac{{Referigeration\;Capacity}}{{Work\;input}}\)

1 Ton of Refrigerant = 210 kJ/min = 3.5 kW

__Calculation:__

Given, Refrigeration capacity = 3 tons = 3 × 3.5 kW = 10.5 kW, COP = 6

\(6 = \frac{{10.5\;kW}}{{{W_{In}}}}\)

Win = 1.75 kW