The correct answer is A.
Both of them are two sentences liked by a contrasting conector. The first option is punctuated correctly because it presents a comma separating the sentences, unlike the second option. The first option is also ended with a full stop whereas the second one is unfinished.
My father and mother...Love...My sister and me
Hope I helped
The studies comparing a typical school meal to recommended dietary allowances would be the best option for a research paper. In a research paper, one is usually looking for cold, hard facts, and an athlete and school cafeteria workers are not necessarily experts on nutrition.
Maybe you should ask some real English questions .-.
