Which of the following orders of insects are killed by Bacillus thuringiensis?

All of these

a- Lepidopterans

b- Coleopterans

c- Dipterans

d- All of these is the correct option

Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein.