Answer:
A supernova results in a massive explosion of a star.
The correct answer for the problem is 2 cylinders. Taking the volume of each cylinder gives a value of around 180 cm^3. Since the volume of one solid block is 360 cm^3, the value should be divided by the volume of the gold cylinder to know how many cylinders are needed. Dividing 360 by 180 gives 2.
C. Urbanization is going on throughout the world.
D.16 Just search it up it says 18 so just put closest number to that which is 16