The salinity in the brackish water ponds:

Correct option is B

Correct Answer: (b) 0.5–30 ppt
Explanation:
→ Brackishwater ponds exhibit salinities between freshwater and seawater, typically 0.5 to ~30 ppt, depending on tidal influence, evaporation and freshwater inflow.
→ This range supports brackish species like milkfish, mullets and penaeid shrimps.
Information Booster:
→ Management adjusts salinity by controlling sluice gates, freshwater inflows and timing of tidal exchange.
Additional Information (Other Options):
(a) Freshwater; (c),(d) near-marine to hypersaline ranges.