Choose the correct pronoun among the following to add at the end of the sentence:

All failed expect _______.

The correct option is B) ‘him’. The words that are used in place of a noun are pronouns.  The name of a person, place, animal, or item can be the noun that is replaced. The given statement, ‘All failed expect____’, requires the addition of a singular third person pronoun. Among the given options, ‘him’ is the only correct choice for the singular third-person pronoun. Hence, making option (B) as the required answer.