Final answer:
The hyphenated form of the isotope with the symbol C-14 is c) Carbon-14, which has a mass number of 14. It has 6 protons and 8 neutrons, with the mass number representing the sum of these particles.
Step-by-step explanation:
The hyphenated form for the isotope with the symbol C-14 is Carbon-14. Isotopes are variants of a particular chemical element which differ in neutron number, while their proton number (atomic number) is the same.
For carbon, the atomic number is always 6, which refers to the number of protons. In the case of Carbon-14, the mass number is 14, indicating that this isotope has 6 protons and 8 neutrons because the mass number is equal to the sum of protons and neutrons.
When discussing isotopes, the mass number is indicated after the element name or symbol. Therefore, among the provided options, the correct answer is (c) Carbon-14.