What is the correct way to complete the sentence: I ran around outside as fast as I could, __________ as she watched me from the kitchen window?

The correct completion of the sentence is "I ran around outside as fast as I could, I as she watched me from the kitchen window." This is because the pronoun "I" functions as the subject in the second independent clause of this sentence. When constructing sentences with two independent clauses, it is essential to use the correct subject pronoun to maintain grammatical accuracy and ensure that both clauses agree with the proper subject form.

Using "I" aligns with the subject role, which is critical for clarity and correctness in this context. The other pronouns do not serve as appropriate subjects in this scenario and would disrupt the sentence's grammatical flow. It’s essential to use subject pronouns like "I" when they are the subject of the verb, while the other pronouns mentioned would be used differently in other contexts.