Can you explain how you understood. Because my understanding is that the contrapositive does create something that goes directly against the stimulus, even if the last line is talking about investment not prices. "Or" becomes "and" when negated when we are talking about or in the sense that it can be both not either or. In this case, we are talking about either or.

#feedback please help with better explanation of D. is it because contradict is different than invalid argument?

#feedback Which of the 21 common argument flaws from version 1 does this question fall under?