Which of the following sentences deviate from the convention that involves commas and coordinating conjunctions?

John List of the University of Chicago and Uri Gneezy of the University of San Diego are pioneers in the field of behavioral economics, creatively using field experiments to test how people respond to different incentives. In 2013, they teamed up to write The Why Axis: Hidden Motives and the Undiscovered Economics of Everyday Life . Early on in the book, they explain their overall approach:

To get at the real underbelly of human motivation, we run experiments in the wild, where we can observe people going about their business in their natural environments when they’re not aware that they’re being watched. Then we crunch the results to come up with the conclusions that will change the way you view humanity, and yourself.

Notice that the comma in the underlined sentence deviates from the current convention involving coordinating conjunctions. What might explain why List and Gneezy decided to punctuate the sentence the way they did?

Mark all that apply.