Answer:
The correct answer is option A. "Replacing damaged tissue".
Step-by-step explanation:
Adult stem cells are undifferentiated cells that could be found within the body of an adult. The function of these type of cells is to replenish dying cells in the body and replacing damaged tissue. Adult stem cells have been identified in many tissues, including the brain (neural stem cells), bone marrow (hematopoietic stem cells), heart (cardiac stem cells), among many others.