Answer the following question given this paragraph: 

With fracking, fluids are pumped through a borehole. The fluids create fractures in the rock that contains the natural gas. Chemicals in the fluid prevent the fractures from closing. The natural gas can then be pumped to the surface.


Q: In what energy industry process are fluids pumped through a borehole, creating fractures in the rock that contains the natural gas?

 Choices:

- grinding

- oil wells

- strip mining

- fracking

A:
fracking
