What would this be? 
A. Carbon-12 
B. Carbon-14 
C. Oxygen-14
D. More than one of these
                                             
                                          
                                          
                                        
											 
											Answer:
B. Carbon-14
Explanation:
by adding the protons and neutrons you get the mass number which in this case would be 14. this eliminates answer choice a.
I hope this answers your question(s). Have a good weekend!