How Can Embryonic Stem Cells Be Used to Advance Medical

How can embryonic stem cells be used to advance medical research on disease in humans?

A) Stem cells with known diseases built in can be grown into embryos, which can then be subjected to experimental treatments.
B) Because they won't be rejected by a patient, one's own stem cells can be used in a variety of experimental treatments with minimal risk.
C) Stem cells can have specific genes altered to cause disease, and then by watching how they develop, scientists will learn how a disease develops, and they will have a model to try treatments, rather than using animals.
D) Because stem cells can become any other cell, any stem cells can be used as a trial treatment in anyone.
E) Stem cell treatments are safe to use because they contain embryonic DNA which won't be rejected by a patient.