Answer:
D) Nematodes provide a home for baceria, and bacteria provide nutrient to nematodes.
The Use of Plant Growth-Promoting Bacteria to Prevent Nematode Damage to Plants
It has been estimated that 100 g of bulk soil can host about 2000–4000 nematodes and this amount is increased 5-fold in the rhizosphere. A certain number of these nematodes are pathogenic for plants and cause yield and economic losses. Application of chemical nematicides is the most common method used to reduce nematode populations, but these chemicals can have a negative impact on both the environment and human health. Therefore, other more environmentally friendly methods of suppression of plant-parasitic nematodes have been proposed. Among them, the use of plant beneficial soil bacteria, behaving as biocontrol agents against nematodes, represent a potential alternative to chemicals.
Explanation:
Resource Used:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7695023/
I hope this helps you in any shape or form.