Which of the following lists the correct requirements for a black hole to form?
a. a star must be 29 times large than earth’s sun , and a supernova explosion must have occurred .
b. a star must be 10 to 28 times large then earth’s sun, and supernova explosion must have not occurred.
c. the star must be 10 to 28 times larger than earth’s sun, and a supernova explosion must occurred
d. the star must be 29 times larger than earth’s sun, and a supernova explosion must not have occurred.