A. Upper-right corner
B. Upper-left corner
C. Bottom-left corner
D. Bottom-right comer
In general, atomic radius increases moving down a group due to the increasing number of electron shells. In general, atomic radius decreases moving from left to right across a period due to the increasing number of protons in the energy level. Therefore, atoms of elements in the bottom-left corner of the periodic table tend to have the largest atomic radii.
Therefore, the Correct Answer is C.