PLEASE HELP ME (AND DONT STEAL) THANK YOU

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Which number line correctly shows 0.8 + 0.3?