Which of the Following Processes Must Be Performed on Adult

Multiple Choice

Which of the following processes must be performed on adult somatic cells in order to induce them to become pluripotent stem cells?

A) A retrovirus is used to introduce four master regulatory genes.
B) The adult stem cells are fused with embryonic cells.
C) Cytoplasm from embryonic cells is injected into the adult cells.
D) The nucleus of an embryonic cell is used to replace the nucleus of an adult cell.