The correct options are
A This type of nutrition fulfills both the needs of algae and the fungi.
B The fungi provides water, minerals and shelter to the algae.
D The algae provides food and nutrients to the fungi.
The type of association where two organisms live together and are mutually beneficial to each other is known as a symbiotic association. For example, lichen is a perfect example for symbiotic association which is between a fungi and an algae. In this association, the fungi provides water, minerals and shelter to the algae which in return provides food to the fungi.