Only the adult stage of a flea feeds on blood, typically from a host like a pet or human. Flea larvae feed on organic debris and flea feces (dried blood), not directly on blood. TheGeneral Pest Management: Guide for Commercial Applicators - Category 7A(Chapter 7: Fleas) details this life cycle. Option B (adult and larva) is incorrect, as larvae do not feed on blood. Option C (egg and larva) is incorrect, as eggs are non-feeding, and larvae do not consume blood.
[Reference:General Pest Management: Guide for Commercial Applicators - Category 7A(MSU Extension), Chapter 7: Fleas.]
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