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

Multiple Choice

Which types of processes are likely when the neutron-to-proton ratio in a nucleus is too low?
I
Α decay
II
Β decay
III
Positron emission
IV
Electron capture

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