To help your investigation, here is some more data about the farm.
The chicken population was started with chicks from a different farm.
Chickens are raised in barns where bacteria can spread easily between chickens.
CJ, E. Coli, and Salmonella bacteria are all present in the barns.
Some of the E. Coli and Salmonella bacteria have alleles that make them resistant to the FQ antibiotic.
To stop disease from growing in the barn, the FQ antibiotic is fed to the chickens a lot.
Choose which way of evolution caused the FQ antibiotic resistance.
Gene Flow
Genetic Drift
Natural Selection
What is the best fit option here? Form a hyptothesis

Natural selection prompts and results in anti-microbial and antibiotic resistance. Change in the mutation of the bacteria microbes make them impervious to antibiotics and when they duplicate further, they transfer this safe trait attribute to their progenitors, which will result in a fully resistant and completely safe generation. Random transformation normally causes obstruction against antibiotics by regular selection. Bacteria that are safe will proceed further to multiply within the sight of the antibiotics and expansions in number after some time. Eventually, the result is an increase in the populace of the microorganisms that are mainly resistant to the bacteria.