You can change the sample size. But the general principle is, the higher the sample size, the higher the power. So you want a highest possible sample size. And you're going to have a higher power if the true proportion is further from your hypothesis, your null hypothesis proportion. And so we want the highest possible N, and that looks like an N of 200, which is there and there. And we want a true proportion of customers that would actually buy coffee as far away as possible from our null hypothesis, which once again would not be under Asha's control. But you can clearly see that 50% is further from 30 than 32 is, so this one, choice D, is the one that looks good.