how development of agriculture was a turn point in human history

Paper focused on the development of agriculture,
Which one of these four events was the most important in human history and why?
What is it about that event that makes it the most important?
Make sure to use at least one site from the attached readings
Citations are very informal for example just the name of the book and the page number
example:  (Images of the past, #)
if other sources are used then must create bibliography and still cite in casual format