Given the four concrete mixes as shown in the table below, one without water reducers and three (c1-c3) with water reducer. The most economic mix where the workability and compressive strength...

Extracted text: Given the four concrete mixes as shown in the table below, one without water reducers and three (c1-c3) with water reducer. The most economic mix where the workability and compressive strength maintained as for the original mix (the mix without water reducers) is With water Reducer Without water Reducer C1 C2 C3 Cement, Kg/m3 850 765 850 850 Water, Kg/m3 465 419 370 465 Slump, mm 50 S1 50 S2 Compressive Strength (MPa) 38 fc1 fc2 fc3 Select one: O A. C3 О В. С2 О С.С1 O D. C1 and C2