The finalists for the competition were Lauren, Sharon, and __________.
C. I; subject.
<span>The finalists for the competition were Lauren, Sharon, and I. It is in English grammar rule that always use I not me.
</span>Subject because I is also a subject in the given sentence.
The third sentence:
Ming and her sister, who is home from college for spring break, organized a bake sale to benefit the victims of the fire.
If the audience is very young, the primary goal is to entertain. For older people, however, there are a variety of different things the writer could be trying to accomplish, such as persuading, entertaining, and even informing. For that, you'd have to look at the content.
Hope this helps, and have a nice day!