Concept:Biting and chewing insects use strong mandibles to tear and consume solid plant tissues.
Explanation:Armyworm, termite, and grasshopper all possess biting and chewing mouthparts.
They feed by cutting, biting, and swallowing leaves, stems, and roots.
Cotton stainer, mealybug, and whitefly are piercing and sucking insects, not chewers.
Cricket does chew, but cotton stainer in option A makes that group incorrect.
Therefore, the group that correctly represents biting and chewing crop pests is armyworm, termite, and grasshopper.
Answer:C. armyworm, termite and grasshopper