Xerophytes have small, thick leaves to:

Explanation

Xerophytes are plants that are adapted to survive in environments, with very little water. Option A describes a feature of a hydrophyte, that grows on water.Option B describes the correct feature, which is limiting the loss of water, but this is not done by 'increasing the surface area'. Water loss is limited by 'decreasing the surface area of the leaves'.Option C describes a feature of halophytes, which grow in conditions of high salt content in the soil or water.Option D describes the correct feature along with the correct adaptation, i.e. limiting water loss by 'reducing the surface area' of the leaves, as xerophytes need to conserve water and they do this by having small leaves, with a thick waxy coating and sunken stomata.