This is the 1104th most frequent Japanese word.
選ば
"選ば" is the stem form of the verb "選ぶ," meaning "to choose" or "to select."
The word '選ば' is used in the inflected form '選ばなければならない' that expresses an obligation to choose.
彼は慎重に職業を選ばなければならない。
He must carefully choose a profession.
The word '選ば' is modified to '選び', used here in the imperative form directing the act of selecting.
最も適切な答えを選びなさい。
Please choose the most suitable answer.
The word '選ば' is in the passive form '選ばれた', indicating that the subject has been chosen by others.