The whole website is two buttons, so that's pretty much accurate.
Either that, or your coworker themselves would laugh and tell you about it later.
That’s also where this quiz lost me. I wouldn’t respond in either way, I’d say “all buttons look blue now. Can we make it so that just the Add to Cart button is blue? I’m okay with Add to Cart having its own class to make it easier.” or something.
FYI I actually agree, it also surprised me. Anyway everything is deterministic on the website so it's not like that prompt actually has an influence on anything.