The answer is: “Something or someone that is not capable of making a mistake.”
The answer is: [A]: True .
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So here's my "translation" of each of the passages:
A. I'm really in love you, Romeo, and I really am telling the truth!
B. I'm so in love with you I forgot how to count, and I think three is four. Regardless, if you really do love me, tell me tomorrow and we can get married then.
C. Unless you're about to change your mind about loving me, don't say that you love me like something that changes, because that means that your love for me will change.
D. Darn, I really love you, so much that I'm murderous towards you, and I can barely handle being away from you.
Okay, those were more for comic relief, but they were very, very loose translations of those snippets of texts. So, with them, we can clearly see that C is the right answer.
