The Relationship Between the Fungi and Algae in Lichens Is

The relationship between the fungi and algae in lichens is best described as

A) a simple cooperative mutualism between normally free-living strains.
B) a possible controlled parasitism wherein the fungi withdraw food from the algae and the algae do not benefit from the association.
C) an endosymbiotic transfer of the chloroplasts of algae to the hyphae cells.
D) a complete mixing of the genomes of the two groups at the cellular level.
E) a possible controlled parasitism wherein the algae are moistened and protected by the fungi,but the fungi do not benefit from the association.