Concept:Guinea grass is a pasture species, and tests often require matching a common name with its correct scientific name.Explanation:The grass commonly known as guinea grass in West Africa is scientifically named Panicum maximum.It is a tall, robust perennial with a short creeping rhizome and stems that may grow up to 2m.When the stems bend, nodes touching the soil form roots and new plants.This description helps distinguish it from other options: Imperata cylindrica is spear grass, Cynodon dactylon is Bermuda grass, and Andropogon gayanus is gamba grass.Thus, the common guinea grass corresponds to Panicum maximum.Answer:A. Panicum maximum