Question Statement:
Which of the following chemical criteria and index ranges indicate severe water quality hazards for agricultural irrigation?
Options:
- (A) Electrical conductivity $EC > 3.0\text{ dS/m}$ (indicating severe salinity hazard)
- (B) Sodium Adsorption Ratio $SAR > 9.0$ under low salinity (indicating high sodicity hazard and soil permeability degradation)
- (C) Residual Sodium Carbonate $RSC > 2.50\text{ meq/L}$ (indicating hazardously high alkali hazard requiring chemical amendments)
- (D) Boron concentration exceeding $2.0\text{ mg/L}$ for boron-sensitive crops