What happens to atomic size as one moves down a group of the modern periodic table?

1. Going down a group, a new electron shell is added at each step. 2. This raises the distance between the nucleus and the outermost electrons. 3. So the atomic size increases despite the rising nuclear charge. 4. Rule out B: that is the across-a-period trend, not the down-a-group trend. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.34_