'Lichens' are association between

Answer: Option B

Lichens are associated between Fungi and algae.
A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic association. Lichens have properties different from those of their component organisms.
Lichens do not have roots that absorb water and nutrients as plants do. But like plants, they produce their nutrition by photosynthesis. when they grow on plants, they do not live like parasites, but instead, they just use the plant's surface as a substrate and in return give nutrients to plants.