What change occurs in the atomic structure during beta decay, and how does it affect the periodic table?

• A. A proton is converted into a neutron, decreasing the atomic number by 1, moving the element to the previous position in the periodic table.
• B. An electron is added to the nucleus, increasing the atomic mass by 1, but not affecting the atomic number.
• C. A neutron is converted into a proton, increasing the atomic number by 1, moving the element to the next position in the periodic table.
• D. A neutron is converted into an electron, decreasing the atomic mass by 1, but not affecting the atomic number.