Final answer:
Tall fescue has the best shade tolerance among the turfgrasses listed, thriving in moderate shade with its deep root system and ability to adapt well to different light conditions. option a.
Step-by-step explanation:
Among the turfgrasses listed, tall fescue (Festuca arundinacea) generally has the best shade tolerance. Tall fescue is a cool-season grass that is known for its deep root system and the ability to thrive in moderate shade, while still doing well in sunny areas.
Comparatively, creeping bentgrass prefers open, sunny areas to develop a dense turf. Kentucky bluegrass and fine-leaf fescues have moderate shade tolerance but are usually outperformed by tall fescue in shaded conditions. Perennial ryegrass, on the other hand, prefers full sun and has limited shade tolerance.
In the context of the effects of climate on grasses, such as suggested by Gallagher et al. (2013), the ability of turfgrasses to adapt to changing environmental conditions, including light availability, becomes an important aspect of their suitability for various landscapes.