If only I richer.*
am
were
would be
will be

If only I am were richer is correct. If it was “an” use it before words that start with a vowel sound. Would be would mostly meant like in place or like when your saying something that you want to explain and will be really don’t make sence.

in night, why are wiesel and his father evacuated from the auschwitz concentration camp? a massive escape makes the nazis question the security of auschwitz. they are assigned to work as laborers in a factory at another camp, buna. hitler has ordered that all remaining jews be relocated within german borders. the german army needs the camp guards to go to the battle front for a last-chance defense.

i cannot see any of the options