The correct options are
C Bone marrow
D Umbilical cord
Stem cells are a group of undifferentiated cells. They are present in the umbilical cord which connects the foetus to the uterus of the mother. Stem cells are also present in red bone marrow which is responsible for the production of blood cells. Stem cells are not present in eye or gall bladder. These organs contain differentiated cells which perform specific function.