Answer:
The correct answer is option D.
Step-by-step explanation:
Orchid is a flowering plant which forms the mycorrhizal associations with the fungi.
The association is formed between Basidiomycota phylum of fungi especially Rhizoctonia species with the seeds and roots of orchids.
After the seeds are released and land on suitable substratum, they are colonized by the fungi. Associated fungi supply nutrients and energy to the orchid plant seeds and during developmental stages as seeds can degrade and digest the hyphae of the fungi while fungi receive sugar from the plants once they become established.
Thus, option D is the correct answer.