Answer:
A.
They could develop into 130 different human tissue types.
Step-by-step explanation:
"Embryonic stem cells are also known as "pluripotent stem cells." They are
special cells that are formed at the very early stages of human embryonic
development. They are part of what is known as a "blastocyst." A
blastocyst is the modified blastula stage of a mammal's embryo. Stem
cells are unique because at this early stage of development, they are not
yet specialized. The cells are capable of developing into 130 different
types of human tissue. Embryonic stem cells are essentially the building
blocks of the human body."