Concept:The parasite absorbs already digested nutrients from the host directly through its body surface by diffusion.Explanation:The illustrated parasite has no specialised mouth or digestive system.It lives inside the host where digested food is readily available.These soluble nutrients pass from the region of higher concentration in the host to the lower concentration inside the parasite.This movement of dissolved food substances across the body wall is called diffusion.Osmosis is limited to the movement of water, not nutrients, so it does not explain this process.Answer:B. diffusion
