Which Types of Processes Are Likely When the Neutron-To-Proton Ratio $\alpha$

Multiple Choice

Which types of processes are likely when the neutron-to-proton ratio in a nucleus is too low?
I. $\alpha$ decay
II. $\beta$ decay
III.positron production
IV.electron capture

A) I,II
B) II,III
C) III,IV
D) II,III,IV
E) II,IV