Iknow how to find the volume and height, but can't seem to find the radius. the answer i got was incorrect, but it's the only one i keep getting. what would the answer be?

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?