Which pronoun correctly completes the sentence?

The correct pronoun to complete the sentence is "I." This pronoun is used as the subject of a verb, indicating who is performing the action. In sentences where the subject is doing something, "I" is the appropriate choice.

In contrast, "me" is an object pronoun, used after verbs or prepositions, while "myself" is a reflexive pronoun used to refer back to the subject when the subject and object are the same person. "Us" is also an object pronoun, but it is used to refer to a group that includes the speaker. Therefore, when completing a sentence where the pronoun is part of the subject performing the action, "I" is the grammatically correct choice.