Terrestrial Insects Are Large Enough That Diffusion Through Simple Openings

Terrestrial insects are large enough that diffusion through simple openings on their body surface is insufficient to supply oxygen to their tissues. Instead, insects deliver oxygen:

A) to their tissues through a series of lungs within their body.
B) directly to their tissues through branching structures called tracheoles.
C) to their tissues by opening spiracles that allow oxygen to enter their body cavity directly.
D) to their tissues by opening their mouths and creating negative pressure that draws air in to move through their tissues.