The correct option is C Both A and B
Definition of antibiotics :
Antibiotics are chemical substances produced by certain microbes that can either kill or inhibit the growth of other disease-causing microbes.
Source :
Antibiotics help in providing a competitive advantage to organisms that produce it. Large populations of microbes like bacteria, actinomycetes and fungi are present in the soil. Therefore, some of these organisms produce secondary metabolites (antibiotics) as a survival strategy that kill or inhibit the growth of other microbes.
Final answer :
(C) Both A and B