Astronomers had already discovered that the super-massive black holes which sit in the centres of various galaxies were growing faster. Professor Graham explained that every time there is a ten times increase in the stellar mass of the galaxy, it leads to around 100 times increase in the ______________. Fill in the blank with an appropriate option:

Astronomers had already discovered that the super-massive black holes

1.	Astronomers had already discovered that the super-massive black holes which sit in the centres of various galaxies were growing faster. Professor Graham explained that every time there is a ten times increase in the stellar mass of the galaxy, it leads to around 100 times increase in the ______________. Fill in the blank with an appropriate option:
A.	Mass of black hole
B.	Density of black hole
C.	Both of these
D.	None of these
Answer» B. Density of black hole