Based on the article describing beyene's windpipe transplant, why is it necessary to take 3d scans of a diseased organ before a replacement organ can be created using stem cells? a. to find the organ's exact location within the body b. to find the best injection site for the stem cells c. to track the progress of the stem cells after they are injected into the diseased organ d. to create a scaffolding for the stem cells while they recreate the diseased organ