Which plant bears long, flat leaves that are one inch wide and grass-like in appearance?

The correct choice is the plant that is characterized by long, flat leaves that are typically about one inch wide and have a grass-like appearance. Cattails (genus Typha) fit this description well. These plants commonly grow in wetlands and have elongated, slender leaves that extend upward, creating a distinctive profile that resembles that of grasses.

Cattails are also known for their cylindrical flower spikes, which emerge above the leaves. This overall morphology contributes to their easy identification in aquatic environments. In contrast, the other plants listed have different leaf structures. For instance, purple loosestrife has more broad and elongated leaves that do not resemble grass, elodea has softer and more submerged leaves with a different structure, and waterlilies have broad, rounded leaves that float on the water's surface, further differentiating them from cattails. Recognizing these physical characteristics is essential for understanding aquatic plants and effective management strategies.