Concept:Striga spp., known as witchweed, is a root parasite that feeds on certain crop plants.Explanation:Striga attaches itself to the roots of host plants and absorbs water and nutrients.It commonly attacks cereal crops such as sorghum, maize, and millet.Among the listed options, sorghum is the typical host of Striga.Therefore, the correct choice is the crop affected by this parasitic weed.Answer:D. sorghum