'Sterna spatula' is present in which insect?

Answer: Option B

'Sterna spatula' is present in Gall midges insect.
Cecidomyiidae is a family of flies known as gall midges or gall gnats.
The larva is peripneustic. The head is tiny, cone-shaped, and has two posterolateral extensions. The mouthparts are reduced, with minute styliform mandibles.
The relatively prominent antennae are two-segmented. Integumental setae or papillae are important in taxonomy since they are constant in number within groups. The prothorax has sclerotized sternal spatula.