Aggravated with a capital 'A'

My first assignment for my one class was given back to me graded today. And, umm, I'm aggravated because even though I got an okay grade on it (95/100), she made ALL these grammatical "corrections" on it and they weren't even correct! I think pretty much the first rule of grammar that we all learned as youngsters was to match the subject to the verb; in other words, if your subject is plural, so should your verb be plural. Maybe I've been wrong all these years... but in my experience, "Options are: a, b, c and d." is more correct than "Options is: a, b, c and d." She made these kinds of "corrections" at least three times in my two-page paper! I just don't understand... am I supposed to point out to her that she is an idiot? Probaby not, right? I also might be more accommodating of her corrections if her lectures each week weren't chock-full of typos and grammatical inaccuracies. Like, how dare she even feel she has the right to comment on my grammar with the way she butchers it every week in her lectures. Also, I don't think she is a native English speaker so maybe she might want to refrain from correcting those who are native English speakers... UGH!