Here's a problem to solve: An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?

Among the 4 following options, which is the correct answer?

- A: 50 protons, 69 electrons, 50 neutrons
 
- B: 50 protons, 50 electrons, 69 neutrons
 
- C: 69 protons, 50 electrons, 69 neutrons
 
- D: 69 protons, 69 electrons, 50 neutrons
 