The answer is is A. The narrator wanted Fortunato to thinks
that he is concerned for his health.
The narrator wanted to kill Fortunato by covering it up with
a lie. The narrator wanted to lure Forunato so that he can easily kill him.
I'd say it's not very reasoning.
Hope this helps.
I don't know if it's a multiple choice question or not, but these are some words that would work. Secretive, cryptic, introverted, shy, or uncommunicative. By the way you spelled because wrong.