The following sentences have been transformed as per the directions given in their brackets. Choose the correct sentence from the choices given.
Subhas's father was content to be able to help his son. (Compound)
1
Subhas's father was content for he was able to help his son.
2
Subhas's father was content being able to help his son.
3
Subhas's father was content as he was able to help his son.
4
Subhas's father was content because he was able to help his son.