The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is

(A) $\mathrm{C}_{3} \mathrm{~A}$

(B) $\mathrm{C}_{3} \mathrm{~S}$

(C) $\mathrm{C}_{2} \mathrm{~S}$

(D) $\mathrm{C}_{4} \mathrm{AF}$

The compound which is largely responsible for initial setting and early strength gain of Ordinary Portland Cement is

(A) $\mathrm{C}_{3} \mathrm{~A}$

(B) $\mathrm{C}_{3} \mathrm{~S}$

(C) $\mathrm{C}_{2} \mathrm{~S}$

(D) $\mathrm{C}_{4} \mathrm{AF}$

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