Question Statement:
Read the passage:
"In micro-irrigation systems, emitter clogging remains the single greatest impediment to sustained hydraulic performance. Clogging is predominantly bio-chemical: iron-precipitating and sulfur-oxidizing bacteria secrete sticky mucilaginous slime sheaths that aggregate suspended colloidal clay particles into dense biofilms. Standard hydraulic flushing alone is insufficient to dislodge these adherent matrices; periodic chemical injection with chlorine is indispensable for oxidative degradation of the organic binder."
Which conclusion is most directly supported by the text?
Options:
- (A) Routine physical flushing with pressurized water completely prevents emitter clogging indefinitely.
- (B) Biological slime matrices bound by bacterial secretions necessitate periodic oxidative chemical remediation.
- (C) Drip irrigation emitters never clog if source water is passed through basic gravel filters.
- (D) Iron bacteria in irrigation pipes directly improve crop root nutrient uptake.