The largest sections in the lower level for a basketball game are behind the basket, where double-letter rows AA-LL fill in empty space between the basket and the end of the hockey boards. Within this area, there are a number of seats you'll want to avoid.
First, you'll want to completely avoid rows EE-LL. All double-letter rows are on temporary seating that rises only modestly away from the court. Therefore, if you end up with a taller person anywhere in front of you, it may be difficult to see over him or her. In rows AA-DD there is a smaller likelihood of being behind a tall person and your proximity to the court outweighs this negative.
You'll also want to re-consider rows A-S in sections 201 and 215. These sections are directly behind the basket (which is common for hockey/basketball arenas, but not in basketball-only venues) and are the most highly obstructed seats. It will be difficult to see made baskets on the hoop nearest you, and may be nearly impossible to see any baskets on the far hoop. As an alternative, choose higher rows in sections closer to the corner of the arena where you can see around the basket.