A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If <j) index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is___________________?
(A) 4.5 cm
(B) 6.0 cm
(C) 7.5 cm
(D) 9.0 cm
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