The sentence which is the most objective is <span>A. My mother taught Italian lessons at the community center.
</span>It is a fact, therefore it is objective. The other sentences are somebody's opinions - stupid sisters, crazy Greek family, a real pain - these words show that it is someone's opinion, which is subjective, not objective.
She kills herself because they couldn't be together anymore
Greg gets along better with other people at the end of the story because he leans a valuable lesson from fighting the thugs with Lemon Brown.