The answer you must provide a central or a main idea.
Answer:
In passive sentence constructions, the direct object (the objective or goal) is in the subject position. Active structure puts the actor in the subject position. To find the actor of a sentence, look for the action word – the verb – and figure out who did it. Sometimes, you may need to add an actor to the sentence
An independent clause is a sentence or part of one that can stand alone.
So I have a feeling that the first one is correct as "My sister and I love to cook" and "we spend hours cooking together" can both stand alone yet are joined by a semicolon.
I hope this has helped
