Suppose you run an experiment to see how many people came to your party depending on whether you announce that it will be popular or you play it cool and don't promise anything. You are obsessed with your party's success and decide to run an experiment. The next day, you arrive at the classroom and decide to sit in a random seat in the class. Then you decide to tell the classmates in front and behind you that the party will be popular. Then you tell the people on your left and right about your party, but you don't bring up your party's popularity. You ran: (1 point) (a) a natural experiment (b) a randomized controlled trial (c) neither (d) both