Hello Cs1011200,
How are you doing? Groups are placed vertically in each line on the periodic table. So Group 1, 2, and 3 are the first three to the left. If you notice, Group 1 is Alkali Metals, group 2 is Alkali Earth Metals, and group 3 is Transition Metals. If you notice, all three are metals! Therefore, A. should be your answer. Hope I helped.
Thank you,
Darian D.
