Stylets are present in the mouth parts of following

Answer: Option A

Stylets are present in the mouth parts of Plant bugs.
Both mandibles and maxillae are modified into long slender sclerotized hair-like structure called stylets. They are lying close together and suited for piercing and sucking.
The tips of the stylets may have minute teeth for piercing the plant tissue. The inner maxillary stylets are doubly grooved on their inner faces.