If the Parent Nucleus Has N Neutrons and Z Protons $\alpha$

Multiple Choice

If the parent nucleus has N neutrons and Z protons, after an $\alpha$ decay, the daughter nucleus has respective neutron and proton numbers of

A) N and Z - 1.
B) N and Z + 1.
C) N - 2 and Z - 2.
D) N - 1 and Z - 1.
E) N and Z.