The correct options are
A To make their own food
B To absorb nutrients from the soil
C To keep themselves cool
D To stand upright
∙ Water along with carbon dioxide and sunlight is used by plants to prepare there own food.
∙ It also helps the plant to absorb nutrients present in the soil.
∙ Water helps to keep the plant cool.
∙ Water content in the plant's body helps it to stand upright.