I hope a lot of people got it right! Was it too easy for you? Or too difficult for you?
I quickly explained why b is correct and why a and c are not correct. Did you understand?
The English sentence is "Zombies are not scary." a, b, and c are all negative sentences. Did you notice that? I'm going to explain a bit more here on my blog.
a. ゾンビは、こわいじゃない。Zombie wa kowai janai.
Why is it wrong? Because kowai is i-adjective. "janai" is used for the negative form with na-adjective.
For example, "げんきじゃない" "Genki janai"
Genki na is na-adjective. So when you make a negative form, you use "janai" at the end, and you get rid of "na" from "genki na". "Kowai" is i-adjective. That's why a is a wrong answer.
b.ゾンビは、こわくない。Zombie wa kowaku nai.
As I said, kowai is i-adjective. When you make a negative form, you use "nai" at the end, and get rid of "i" from kowai. This is the correct answer.
c. ゾンビは、かわいくない。Zombie wa kawaiku nai.
Some people get confused "kawaii" and "kowai" sounds. So I thought that it might be a good one for multiple choice question.
kawaii is cute. kowai is scary. They are completely different meaning. So please be careful.
You don't want to say" your cat is scary!" Right?