Respuesta :
The subject is who the active person in the sentence is: in this case it's 4) I -I'm the one who does the action corresponding to the main verb in the sentence (invite). "You" is an object here.
The word that represents the subject of this sentence is 4) I.
The subject is one of the most basic parts of a sentence and it generally refers to a person or thing that is performing an action. Moreover, on some occasions, the subject is just being something. In this specific sentence, the subject is a pronoun ("I") and it is performing an action, that is "inviting". Furthermore, it is a simple subject because it is formed with just one word and no modifiers.