Correct answer: (c) < (b) < (a) < (d) < (e)
The atomic radius generally increases down a group in the periodic table due to the addition of electron shells, while it decreases across a period from left to right due to increased nuclear charge. In this case, fluorine (F) has the smallest radius, followed by oxygen (O), carbon (C), chlorine (Cl), and bromine (Br), which aligns with the correct option.