Concept:Biotic factors are the living organisms in an environment that can influence farming activities.
Explanation:Biotic factors include all living things such as predators, pests, weeds, diseases, and beneficial organisms.
These living components directly affect crop growth, livestock health, and overall agricultural output.
Rainfall is a weather condition and a non-living physical factor.
Humidity is the moisture present in the air, which is also non-living.
Temperature is a physical climatic condition and is classified as an abiotic factor.
Among the given options, only a predator is a living organism.
A predator feeds on other animals and can therefore influence farm animal populations or crop pests.
Thus, the only biotic factor in the list is the predator.
Answer:B. predator