b. Eu posso pôr em risco a minha missão.
c. Eu não posso pôr a minha missão em risco.
Oh, maybe it was out of haste, I had answered in a jiffy so I picked B.
Now, I reread and only then " I CANNOT jeopardize" caught my eye.
The thing is, dyslexic as I am, I previously read B as "Eu NÃO posso pôr em risco minha missão'' and C as "Eu não posso pôr a minha missão em risco." So I went for B, because I tought was more natural.
I have picked many wrong multiple choice questions, this way, by sheer lack of attention, but then it is not lack of attention...I just see one thing and read another, tricks of mind !