Which equation correctly represents electron capture by the nucleus?

Question

Which equation correctly represents electron capture by the  nucleus?

Quizplus · Accepted Answer

Electron capture occurs when an electron is captured by the nucleus, and a proton is converted into a neutron. This means the atomic number decreases by 1, while the mass number remains the same. 
In this case, the original atom is 11eab46b_9c77_83e3_a889_e7a99c1af4a4_TB6485_11, which has an atomic number of 11. 
After electron capture, the new atom would have the same mass number, but the atomic number would be 10, because one proton has been converted into a neutron. 
The only choice that represents this is C, which has an atomic number of 10 and the same mass number as the original atom.

Which Equation Correctly Represents Electron Capture by the Nucleus