Final answer:
Creeping bentgrass (d) is the turfgrass with rolled vernation, a distinguishable midrib, and a somewhat long ligule.
Step-by-step explanation:
Among the given options, the turfgrass that has rolled vernation, a distinguishable midrib, and a somewhat long ligule is Creeping bentgrass (d).
Creeping bentgrass has rolled vernation, which means the leaves are folded inward along the midrib. It also has a distinguishable midrib that can be seen running down the center of the leaf. Additionally, it has a somewhat long ligule, which is a small, membrane-like structure where the leaf meets the stem.
Kentucky bluegrass (a), Bermudagrass (b), and Annual bluegrass (c) do not exhibit all these characteristics.