The correct option is carbon-14.
Here’s the reasoning:
- Protons determine the element, and since there are 6 protons, the element is carbon.
- The number of neutrons is 8.
The mass number (protons + neutrons) for this isotope would be 6 protons + 8 neutrons = 14.
Therefore, the isotope with 6 protons and 8 neutrons is carbon-14.