The answer is A. It is true
Living organisms found in nature react and live with one another in a variety of ways.
Commensalism is the relationship between organisms that interact in nature in what is termed as a symbiotic relationship. One type of symbiosis is commensalism where one organism benefits while the other species involved neither benefits nor is harmed The benefits of one organism can be in a variety of forms including food, shelter transportation and seed dispersal.
Types of commensalism include Chemical commensalism, inquilinism, metabiosis and phoresy