Which type of weed has parallel-veined leaves?

The correct answer is that grass has parallel-veined leaves due to the specific structure of its leaf veins. In grasses, the veins run parallel to the length of the leaf, creating a distinctive appearance that is characteristic of monocotyledons, which are plants that fall under the group known as monocots. This parallel venation helps grasses adapt to their environments, as it allows for strong leaf structures that can withstand wind and the wear from grazing.

In contrast, broadleaf weeds typically exhibit a net-like or branched vein pattern, which is common in dicotyledons. Grass-like plants, while they may resemble grasses, generally do not have the same morphology and can include species that do not strictly fall into the same categories as true grasses. The term "none of the above" does not apply here, as the question specifically asks for a type of weed with parallel-veined leaves, which is accurately represented by grasses.