Question Statement:
Read the passage: 'Hermetic grain storage bags create a modified atmospheric barrier that depletes oxygen and concentrates carbon dioxide through the respiration of trapped insects and grain, suffocating weevils within days without requiring chemical fumigants.' What is implicitly suggested about chemical fumigants?
Options:
- (A) They are not strictly necessary for insect eradication when hermetic physical barriers are used.
- (B) Chemical fumigants increase oxygen levels inside storage silos.
- (C) Hermetic bags are coated with toxic chemical fumigants.
- (D) Weevils are naturally immune to carbon dioxide concentration.