Final answer:
The tree that is LEAST suitable for sandy soils is the Willow due to its preference for moist, well-drained soils and greater water needs. Pines, on the other hand, are more suited for sandy soils thanks to their adaptations to reduce water loss.
Option D. willow is correct.
Step-by-step explanation:
The tree that is LEAST suitable for sandy soils among the options given is the Willow. Willows generally prefer moist, well-drained soils and are often found near water sources. Sandy soils tend to drain quickly and do not retain moisture well, making them a poor match for willow trees that require more water.
On the other hand, conifers like pine trees are more adapted to sandy soils due to their needle-shaped leaves with sunken stomata, which help to reduce water loss in drier conditions. Oaks can also grow in sandy soils as long as they are well-drained, and palms are adaptable to a variety of soil types, including sandy soils.