Doomsday on demand,need help

I’ve tried nearly everything, how do you get the option to convince Ryan to kill Carl?

Same problem anyone please help

You can’t. It has to be Malcolm. I suggest that you raise your popularity with Mal as high as possible.

Or at least, that’s what I have concluded. I restarted 3 times and try to gain my popularity with Ryan as much as I could but that dude just wouldn’t budge so I switched and it worked.