Which of the following, when doped into ultrapure germanium, will convert it into a p-type semiconductor ?

Which of the following , when doped into a crystal of ultrapurified germanium , will convert it into a p - type semiconductor ?

Which of the following , when doped into a crystal of ultrapurified germanium , will convert it into a p - type semiconductor ?

Which one of the following elements on doping with germanium, make it a p-type semiconductor ?

Which one of the following elements on doping with germanium, make it a p-type semiconductor ?

Which of the following elements on doping with germanium, takes if a p-type semiconductor?