[单选题]
If an element of atom k1(qbyl0y jt4ipbg3*+fwv:txfa jy y4 5 ; cd5/qvyc6oc number 15 has an isotope of mass number 32,
A. the number of neutrons in the nucleus is 15.
B. the number of neutrons in the nucleus is 17.
C. the number of protons in the nucleus is 17.
D. the number of nucleons in the nucleus is 15.