Over several years, bacteria were isolated from members of a human population and tested for antibiotic resistance. The percent of bacterial isolates that were found to be antibiotic resistant is presented in the graph above for each year of the study. Which of the following conclusions is best supported by the information presented in the graph?

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The greatest increase in antibiotic increase occurs in the last three years, not the first three.

Gene flow involves movement of genetic information from one population to another, information not readily available in the graph.

Bacteria populations grow rapidly, and evolution occurs quickly.

Over the years, bacteria with antibiotic resistant surive and reproduce at a greater rate than bacteria lacking the resistance.