Final answer:
Bentgrass is the first intensively managed turfgrass used for bowling greens due to its fine texture and ability to thrive under close mowing, providing the desired playing surface for the game. The correct option is a.
Step-by-step explanation:
The first intensively managed turfgrass used for bowling greens is a) Bentgrass. Bentgrass, particularly the species known as creeping bentgrass, is highly valued for its fine texture and ability to tolerate close mowing, which is essential for the smooth, consistent playing surface required in the game of bowling. As a cool-season grass, it is well-suited for temperate climates and is often selected for its superior performance in such settings.